diff --git a/apps/api/src/data/bosses.ts b/apps/api/src/data/bosses.ts
index 21144eb..a5a2989 100644
--- a/apps/api/src/data/bosses.ts
+++ b/apps/api/src/data/bosses.ts
@@ -16,6 +16,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     upgradeRewards: ["click_2"],
     equipmentRewards: ["iron_sword", "chainmail", "mages_focus"],
     prestigeRequirement: 0,
+    zoneId: "verdant_vale",
   },
   {
     id: "lich_queen",
@@ -32,6 +33,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     upgradeRewards: ["global_2"],
     equipmentRewards: ["enchanted_blade", "plate_armour", "arcane_orb"],
     prestigeRequirement: 0,
+    zoneId: "verdant_vale",
   },
   {
     id: "elder_dragon",
@@ -48,6 +50,7 @@ export const DEFAULT_BOSSES: Boss[] = [
     upgradeRewards: ["click_3"],
     equipmentRewards: ["vorpal_sword", "dragon_scale"],
     prestigeRequirement: 1,
+    zoneId: "shattered_ruins",
   },
   {
     id: "void_titan",
@@ -64,5 +67,6 @@ export const DEFAULT_BOSSES: Boss[] = [
     upgradeRewards: [],
     equipmentRewards: ["philosophers_stone"],
     prestigeRequirement: 3,
+    zoneId: "frozen_peaks",
   },
 ];
diff --git a/apps/api/src/data/initialState.ts b/apps/api/src/data/initialState.ts
index bc7a35a..73fa901 100644
--- a/apps/api/src/data/initialState.ts
+++ b/apps/api/src/data/initialState.ts
@@ -5,6 +5,7 @@ import { DEFAULT_BOSSES } from "./bosses.js";
 import { DEFAULT_EQUIPMENT } from "./equipment.js";
 import { DEFAULT_QUESTS } from "./quests.js";
 import { DEFAULT_UPGRADES } from "./upgrades.js";
+import { DEFAULT_ZONES } from "./zones.js";
 
 export const INITIAL_PRESTIGE: PrestigeData = {
   count: 0,
@@ -33,6 +34,7 @@ export const INITIAL_GAME_STATE = (player: Player, characterName: string): GameS
   equipment: structuredClone(DEFAULT_EQUIPMENT),
   achievements: structuredClone(DEFAULT_ACHIEVEMENTS),
   prestige: INITIAL_PRESTIGE,
+  zones: structuredClone(DEFAULT_ZONES),
   baseClickPower: 1,
   lastTickAt: Date.now(),
 });
diff --git a/apps/api/src/data/quests.ts b/apps/api/src/data/quests.ts
index d3a31c3..2f0706d 100644
--- a/apps/api/src/data/quests.ts
+++ b/apps/api/src/data/quests.ts
@@ -9,6 +9,7 @@ export const DEFAULT_QUESTS: Quest[] = [
     durationSeconds: 60,
     rewards: [{ type: "gold", amount: 500 }],
     prerequisiteIds: [],
+    zoneId: "verdant_vale",
   },
   {
     id: "goblin_camp",
@@ -21,6 +22,7 @@ export const DEFAULT_QUESTS: Quest[] = [
       { type: "essence", amount: 5 },
     ],
     prerequisiteIds: ["first_steps"],
+    zoneId: "verdant_vale",
   },
   {
     id: "haunted_mine",
@@ -33,6 +35,7 @@ export const DEFAULT_QUESTS: Quest[] = [
       { type: "upgrade", targetId: "global_1" },
     ],
     prerequisiteIds: ["goblin_camp"],
+    zoneId: "verdant_vale",
   },
   {
     id: "necromancer_tower",
@@ -47,6 +50,7 @@ export const DEFAULT_QUESTS: Quest[] = [
       { type: "upgrade", targetId: "cleric_1" },
     ],
     prerequisiteIds: ["haunted_mine"],
+    zoneId: "verdant_vale",
   },
   {
     id: "ancient_ruins",
@@ -59,6 +63,7 @@ export const DEFAULT_QUESTS: Quest[] = [
       { type: "upgrade", targetId: "click_2" },
     ],
     prerequisiteIds: ["haunted_mine"],
+    zoneId: "verdant_vale",
   },
   {
     id: "shadow_mere",
@@ -72,6 +77,7 @@ export const DEFAULT_QUESTS: Quest[] = [
       { type: "upgrade", targetId: "scout_1" },
     ],
     prerequisiteIds: ["ancient_ruins"],
+    zoneId: "shattered_ruins",
   },
   {
     id: "dragon_lair",
@@ -86,6 +92,7 @@ export const DEFAULT_QUESTS: Quest[] = [
       { type: "adventurer", targetId: "dragon_rider" },
     ],
     prerequisiteIds: ["ancient_ruins"],
+    zoneId: "shattered_ruins",
   },
   {
     id: "frozen_wastes",
@@ -100,6 +107,7 @@ export const DEFAULT_QUESTS: Quest[] = [
       { type: "upgrade", targetId: "global_3" },
     ],
     prerequisiteIds: ["dragon_lair"],
+    zoneId: "frozen_peaks",
   },
   {
     id: "void_rift",
@@ -114,5 +122,6 @@ export const DEFAULT_QUESTS: Quest[] = [
       { type: "upgrade", targetId: "knight_1" },
     ],
     prerequisiteIds: ["frozen_wastes"],
+    zoneId: "frozen_peaks",
   },
 ];
diff --git a/apps/api/src/data/zones.ts b/apps/api/src/data/zones.ts
new file mode 100644
index 0000000..343b386
--- /dev/null
+++ b/apps/api/src/data/zones.ts
@@ -0,0 +1,31 @@
+import type { Zone } from "@elysium/types";
+
+export const DEFAULT_ZONES: Zone[] = [
+  {
+    id: "verdant_vale",
+    name: "The Verdant Vale",
+    description:
+      "Rolling green hills and ancient forests stretch to the horizon. This is where your guild takes its first steps — trade roads in need of clearing, goblin camps to rout, and an undead queen stirring in the north.",
+    emoji: "🌿",
+    status: "unlocked",
+    unlockBossId: null,
+  },
+  {
+    id: "shattered_ruins",
+    name: "The Shattered Ruins",
+    description:
+      "The remnants of a civilisation long lost to war and dragonfire. Crumbling towers and cursed lakes hide treasures — and an elder dragon who claims these lands as his own.",
+    emoji: "🏛️",
+    status: "locked",
+    unlockBossId: "lich_queen",
+  },
+  {
+    id: "frozen_peaks",
+    name: "The Frozen Peaks",
+    description:
+      "At the edge of the world, where the sun barely rises and the cold is a living thing, a tear in reality has drawn something ancient and terrible. Only the mightiest guilds dare tread here.",
+    emoji: "❄️",
+    status: "locked",
+    unlockBossId: "elder_dragon",
+  },
+];
diff --git a/apps/api/src/routes/boss.ts b/apps/api/src/routes/boss.ts
index 683f4e8..26dfab7 100644
--- a/apps/api/src/routes/boss.ts
+++ b/apps/api/src/routes/boss.ts
@@ -152,6 +152,13 @@ bossRouter.post("/challenge", async (context) => {
       nextBoss.status = "available";
     }
 
+    // Unlock any zone whose unlock condition is this boss
+    for (const zone of (state.zones ?? [])) {
+      if (zone.unlockBossId === body.bossId) {
+        zone.status = "unlocked";
+      }
+    }
+
     rewards = {
       gold: boss.goldReward,
       essence: boss.essenceReward,
diff --git a/apps/api/src/routes/game.ts b/apps/api/src/routes/game.ts
index d23e4e9..5708f2e 100644
--- a/apps/api/src/routes/game.ts
+++ b/apps/api/src/routes/game.ts
@@ -72,6 +72,8 @@ gameRouter.get("/load", async (context) => {
   // Backfill new quests and upgrades from defaults (add missing ones)
   const { DEFAULT_QUESTS } = await import("../data/quests.js");
   const { DEFAULT_UPGRADES } = await import("../data/upgrades.js");
+  const { DEFAULT_ZONES } = await import("../data/zones.js");
+  const { DEFAULT_BOSSES } = await import("../data/bosses.js");
 
   for (const defaultQuest of DEFAULT_QUESTS) {
     if (!state.quests.some((q) => q.id === defaultQuest.id)) {
@@ -80,6 +82,15 @@ gameRouter.get("/load", async (context) => {
     }
   }
 
+  // Backfill zoneId on quests that predate the field
+  for (const quest of state.quests) {
+    if (!quest.zoneId) {
+      const defaults = DEFAULT_QUESTS.find((d) => d.id === quest.id);
+      quest.zoneId = defaults?.zoneId ?? "verdant_vale";
+      needsBackfill = true;
+    }
+  }
+
   for (const defaultUpgrade of DEFAULT_UPGRADES) {
     if (!state.upgrades.some((u) => u.id === defaultUpgrade.id)) {
       state.upgrades.push(structuredClone(defaultUpgrade));
@@ -87,6 +98,30 @@ gameRouter.get("/load", async (context) => {
     }
   }
 
+  // Backfill zones on saves that predate the feature
+  if (!Array.isArray(state.zones) || state.zones.length === 0) {
+    state.zones = structuredClone(DEFAULT_ZONES);
+    // Infer unlock state from defeated bosses
+    for (const zone of state.zones) {
+      if (zone.unlockBossId != null) {
+        const unlockBoss = state.bosses.find((b) => b.id === zone.unlockBossId);
+        if (unlockBoss?.status === "defeated") {
+          zone.status = "unlocked";
+        }
+      }
+    }
+    needsBackfill = true;
+  }
+
+  // Backfill zoneId on bosses that predate the field
+  for (const boss of state.bosses) {
+    if (!boss.zoneId) {
+      const defaults = DEFAULT_BOSSES.find((d) => d.id === boss.id);
+      boss.zoneId = defaults?.zoneId ?? "verdant_vale";
+      needsBackfill = true;
+    }
+  }
+
   const now = Date.now();
 
   const { offlineGold, offlineSeconds } = calculateOfflineGold(state, now);
diff --git a/apps/web/src/components/game/BossPanel.tsx b/apps/web/src/components/game/BossPanel.tsx
index 7149314..0bf2910 100644
--- a/apps/web/src/components/game/BossPanel.tsx
+++ b/apps/web/src/components/game/BossPanel.tsx
@@ -2,6 +2,7 @@ import type { Boss } from "@elysium/types";
 import { useState } from "react";
 import { useGame } from "../../context/GameContext.js";
 import { formatNumber } from "../../utils/format.js";
+import { ZoneSelector } from "./ZoneSelector.js";
 
 interface BossCardProps {
   boss: Boss;
@@ -17,7 +18,7 @@ const BossCard = ({
   isChallenging,
 }: BossCardProps): React.JSX.Element => {
   const hpPercent = (boss.currentHp / boss.maxHp) * 100;
-  const isLocked = boss.prestigeRequirement > prestigeCount;
+  const isPrestigeLocked = boss.prestigeRequirement > prestigeCount;
   const canChallenge =
     (boss.status === "available" || boss.status === "in_progress") && !isChallenging;
 
@@ -26,7 +27,7 @@ const BossCard = ({
       <div className="boss-info">
         <h3>{boss.name}</h3>
         <p>{boss.description}</p>
-        {isLocked && boss.status === "locked" && (
+        {isPrestigeLocked && boss.status === "locked" && (
           <p className="prestige-lock">
             🔒 Requires Prestige {boss.prestigeRequirement}
           </p>
@@ -87,6 +88,7 @@ const BossCard = ({
 export const BossPanel = (): React.JSX.Element => {
   const { state, challengeBoss } = useGame();
   const [challengingBossId, setChallengingBossId] = useState<string | null>(null);
+  const [activeZoneId, setActiveZoneId] = useState("verdant_vale");
 
   if (!state) return <section className="panel"><p>Loading...</p></section>;
 
@@ -135,10 +137,19 @@ export const BossPanel = (): React.JSX.Element => {
     }
   };
 
+  const zones = state.zones ?? [];
+  const zoneBosses = state.bosses.filter((b) => b.zoneId === activeZoneId);
+
   return (
     <section className="panel boss-panel">
       <h2>Boss Encounters</h2>
 
+      <ZoneSelector
+        activeZoneId={activeZoneId}
+        zones={zones}
+        onSelectZone={setActiveZoneId}
+      />
+
       <div className="party-combat-stats">
         <div className="combat-stat">
           <span className="stat-label">⚔️ Party DPS</span>
@@ -151,7 +162,7 @@ export const BossPanel = (): React.JSX.Element => {
       </div>
 
       <div className="boss-list">
-        {state.bosses.map((boss) => (
+        {zoneBosses.map((boss) => (
           <BossCard
             key={boss.id}
             boss={boss}
@@ -162,6 +173,9 @@ export const BossPanel = (): React.JSX.Element => {
             }}
           />
         ))}
+        {zoneBosses.length === 0 && (
+          <p className="empty-zone">No bosses in this zone yet.</p>
+        )}
       </div>
     </section>
   );
diff --git a/apps/web/src/components/game/QuestPanel.tsx b/apps/web/src/components/game/QuestPanel.tsx
index e127b03..39c503d 100644
--- a/apps/web/src/components/game/QuestPanel.tsx
+++ b/apps/web/src/components/game/QuestPanel.tsx
@@ -1,5 +1,7 @@
 import type { Quest } from "@elysium/types";
+import { useState } from "react";
 import { useGame } from "../../context/GameContext.js";
+import { ZoneSelector } from "./ZoneSelector.js";
 
 const formatDuration = (seconds: number): string => {
   if (seconds >= 3600) return `${Math.floor(seconds / 3600)}h ${Math.floor((seconds % 3600) / 60)}m`;
@@ -62,16 +64,30 @@ const QuestCard = ({ quest }: QuestCardProps): React.JSX.Element => {
 
 export const QuestPanel = (): React.JSX.Element => {
   const { state } = useGame();
+  const [activeZoneId, setActiveZoneId] = useState("verdant_vale");
 
   if (!state) return <section className="panel"><p>Loading...</p></section>;
 
+  const zones = state.zones ?? [];
+  const zoneQuests = state.quests.filter((q) => q.zoneId === activeZoneId);
+
   return (
     <section className="panel quest-panel">
       <h2>Quests</h2>
+
+      <ZoneSelector
+        activeZoneId={activeZoneId}
+        zones={zones}
+        onSelectZone={setActiveZoneId}
+      />
+
       <div className="quest-list">
-        {state.quests.map((quest) => (
+        {zoneQuests.map((quest) => (
           <QuestCard key={quest.id} quest={quest} />
         ))}
+        {zoneQuests.length === 0 && (
+          <p className="empty-zone">No quests in this zone yet.</p>
+        )}
       </div>
     </section>
   );
diff --git a/apps/web/src/components/game/ZoneSelector.tsx b/apps/web/src/components/game/ZoneSelector.tsx
new file mode 100644
index 0000000..69ceeed
--- /dev/null
+++ b/apps/web/src/components/game/ZoneSelector.tsx
@@ -0,0 +1,32 @@
+import type { Zone } from "@elysium/types";
+
+interface ZoneSelectorProps {
+  zones: Zone[];
+  activeZoneId: string;
+  onSelectZone: (zoneId: string) => void;
+}
+
+export const ZoneSelector = ({
+  zones,
+  activeZoneId,
+  onSelectZone,
+}: ZoneSelectorProps): React.JSX.Element => (
+  <div className="zone-selector">
+    {zones.map((zone) => (
+      <button
+        key={zone.id}
+        className={`zone-tab ${zone.id === activeZoneId ? "zone-tab-active" : ""} ${zone.status === "locked" ? "zone-tab-locked" : ""}`}
+        disabled={zone.status === "locked"}
+        onClick={() => {
+          onSelectZone(zone.id);
+        }}
+        title={zone.status === "locked" ? `Unlock by defeating ${zone.unlockBossId?.replace(/_/g, " ") ?? "the previous boss"}` : zone.description}
+        type="button"
+      >
+        <span className="zone-emoji">{zone.emoji}</span>
+        <span className="zone-name">{zone.name}</span>
+        {zone.status === "locked" && <span className="zone-lock">🔒</span>}
+      </button>
+    ))}
+  </div>
+);
diff --git a/apps/web/src/styles.css b/apps/web/src/styles.css
index 519c4c6..fe9f23f 100644
--- a/apps/web/src/styles.css
+++ b/apps/web/src/styles.css
@@ -1107,6 +1107,73 @@ body {
   font-size: 0.85rem;
 }
 
+/* ── Zone Selector ─────────────────────────────────────────────────────── */
+
+.zone-selector {
+  display: flex;
+  gap: 0.5rem;
+  margin-bottom: 1.25rem;
+  overflow-x: auto;
+  padding-bottom: 0.25rem;
+}
+
+.zone-tab {
+  align-items: center;
+  background: rgba(255, 255, 255, 0.05);
+  border: 1px solid rgba(147, 51, 234, 0.3);
+  border-radius: 0.5rem;
+  color: var(--colour-text-muted);
+  cursor: pointer;
+  display: flex;
+  flex-direction: column;
+  flex-shrink: 0;
+  font-family: inherit;
+  font-size: 0.8rem;
+  gap: 0.2rem;
+  padding: 0.6rem 1rem;
+  transition: all 0.2s;
+}
+
+.zone-tab:hover:not(:disabled) {
+  background: rgba(147, 51, 234, 0.15);
+  border-color: rgba(147, 51, 234, 0.6);
+  color: var(--colour-text);
+}
+
+.zone-tab-active {
+  background: rgba(147, 51, 234, 0.25);
+  border-color: var(--colour-primary);
+  color: var(--colour-text);
+}
+
+.zone-tab-locked {
+  cursor: not-allowed;
+  opacity: 0.45;
+}
+
+.zone-emoji {
+  font-size: 1.4rem;
+}
+
+.zone-name {
+  font-size: 0.75rem;
+  font-weight: 600;
+  text-align: center;
+}
+
+.zone-lock {
+  font-size: 0.7rem;
+}
+
+.empty-zone {
+  color: var(--colour-text-muted);
+  font-style: italic;
+  padding: 1rem 0;
+  text-align: center;
+}
+
+/* ── Loading / Error screens ───────────────────────────────────────────── */
+
 .loading-screen,
 .error-screen {
   align-items: center;
diff --git a/packages/types/src/index.ts b/packages/types/src/index.ts
index 3534afd..f918072 100644
--- a/packages/types/src/index.ts
+++ b/packages/types/src/index.ts
@@ -38,3 +38,4 @@ export type {
   Upgrade,
   UpgradeTarget,
 } from "./interfaces/Upgrade.js";
+export type { Zone, ZoneStatus } from "./interfaces/Zone.js";
diff --git a/packages/types/src/interfaces/Boss.ts b/packages/types/src/interfaces/Boss.ts
index f7b4973..f670fc0 100644
--- a/packages/types/src/interfaces/Boss.ts
+++ b/packages/types/src/interfaces/Boss.ts
@@ -21,4 +21,6 @@ export interface Boss {
   equipmentRewards: string[];
   /** Minimum prestige level required to access this boss */
   prestigeRequirement: number;
+  /** Zone this boss belongs to */
+  zoneId: string;
 }
diff --git a/packages/types/src/interfaces/GameState.ts b/packages/types/src/interfaces/GameState.ts
index 7ecee90..5274ba6 100644
--- a/packages/types/src/interfaces/GameState.ts
+++ b/packages/types/src/interfaces/GameState.ts
@@ -7,6 +7,7 @@ import type { PrestigeData } from "./Prestige.js";
 import type { Quest } from "./Quest.js";
 import type { Resource } from "./Resource.js";
 import type { Upgrade } from "./Upgrade.js";
+import type { Zone } from "./Zone.js";
 
 export interface GameState {
   player: Player;
@@ -18,6 +19,7 @@ export interface GameState {
   equipment: Equipment[];
   achievements: Achievement[];
   prestige: PrestigeData;
+  zones: Zone[];
   /** Click power (gold per click, before upgrades) */
   baseClickPower: number;
   /** Unix timestamp of the last client-side tick */
diff --git a/packages/types/src/interfaces/Quest.ts b/packages/types/src/interfaces/Quest.ts
index cad3e29..fa47120 100644
--- a/packages/types/src/interfaces/Quest.ts
+++ b/packages/types/src/interfaces/Quest.ts
@@ -21,4 +21,6 @@ export interface Quest {
   rewards: QuestReward[];
   /** IDs of quests that must be completed before this one unlocks */
   prerequisiteIds: string[];
+  /** Zone this quest belongs to */
+  zoneId: string;
 }
diff --git a/packages/types/src/interfaces/Zone.ts b/packages/types/src/interfaces/Zone.ts
new file mode 100644
index 0000000..f93b5d2
--- /dev/null
+++ b/packages/types/src/interfaces/Zone.ts
@@ -0,0 +1,11 @@
+export type ZoneStatus = "locked" | "unlocked";
+
+export interface Zone {
+  id: string;
+  name: string;
+  description: string;
+  emoji: string;
+  status: ZoneStatus;
+  /** Boss ID whose defeat unlocks this zone (null for the starter zone) */
+  unlockBossId: string | null;
+}