diff --git a/src/screens/Map.jsx b/src/screens/Map.jsx
new file mode 100644
index 0000000..0b047ef
--- /dev/null
+++ b/src/screens/Map.jsx
@@ -0,0 +1,127 @@
+import { WAYPOINTS, ROUTES } from '../constants.js'
+
+// H3 res-5 cell centre coordinates — hardcoded, h3-js not in browser bundle
+// Cross-checked against constants.js H3 IDs
+const CENTRES = {
+  ostia:      { lat: 41.73, lng: 12.23 },
+  capua:      { lat: 41.09, lng: 14.21 },
+  brundisium: { lat: 40.63, lng: 17.94 },
+  carthago:   { lat: 36.86, lng: 10.32 },
+  alexandria: { lat: 31.20, lng: 29.92 },
+}
+
+// Bounding box clipped to relevant Mediterranean — no Atlantic needed
+const BBOX = { minLng: 5, maxLng: 38, minLat: 28, maxLat: 48 }
+const W = 800
+const H = 460
+
+function project(lat, lng) {
+  const x = ((lng - BBOX.minLng) / (BBOX.maxLng - BBOX.minLng)) * W
+  const y = ((BBOX.maxLat - lat) / (BBOX.maxLat - BBOX.minLat)) * H
+  return { x, y }
+}
+
+// Rough Mediterranean land outline — placeholder, will be replaced
+const LAND = [
+  [43.4,5.3],[41.4,2.2],[40.4,0.7],[39.4,0.2],[38.0,0.1],[37.4,0.8],
+  [36.8,2.3],[36.2,5.4],[36.9,10.2],[37.1,11.1],[33.0,12.0],[32.9,14.0],
+  [32.1,15.0],[30.8,19.8],[30.9,25.2],[31.2,25.3],[31.5,28.0],[31.5,32.3],
+  [31.2,34.2],[33.0,35.1],[35.5,36.2],[36.5,36.2],[36.8,36.6],
+  [36.5,36.0],[35.4,34.6],[35.5,35.9],[36.5,36.2],[36.8,36.6],
+  [37.0,36.2],[37.5,36.8],[36.8,28.0],[37.0,27.2],[37.5,27.0],
+  [38.6,26.8],[39.1,26.4],[39.5,26.1],[40.2,26.3],[40.8,26.0],
+  [41.7,26.4],[41.5,28.0],[40.6,22.9],[40.0,22.6],[39.4,22.5],
+  [38.5,22.0],[37.5,21.1],[36.7,21.9],[37.5,22.4],[38.2,23.6],
+  [40.0,23.5],[40.5,23.0],[41.3,19.4],[42.4,18.5],[43.5,16.9],
+  [44.5,14.5],[45.8,13.6],[45.5,13.8],[44.4,12.3],[43.5,13.5],
+  [41.7,13.7],[40.9,15.6],[40.1,18.4],[38.1,15.7],[37.5,15.0],
+  [38.2,13.0],[37.1,11.8],[38.4,9.4],[39.0,8.9],[39.8,9.6],
+  [41.2,9.3],[41.9,8.7],[43.0,9.4],[43.8,7.4],[43.5,5.3],
+]
+
+const ROUTE_ORDER = ['olive', 'wine', 'grain', 'linen']
+const WAYPOINT_IDS = ['ostia', 'capua', 'brundisium', 'carthago', 'alexandria']
+
+export default function Map({ state }) {
+  const chapter = state?.chapter ?? 1
+
+  const pts = {}
+  Object.entries(CENTRES).forEach(([id, { lat, lng }]) => {
+    pts[id] = project(lat, lng)
+  })
+
+  const currentId = WAYPOINT_IDS[Math.min(chapter - 1, 4)]
+
+  const landPath = LAND.map((c, i) => {
+    const { x, y } = project(c[0], c[1])
+    return `${i === 0 ? 'M' : 'L'}${x.toFixed(1)},${y.toFixed(1)}`
+  }).join(' ') + ' Z'
+
+  return (
+    <div className="map-screen">
+      <svg
+        viewBox={`0 0 ${W} ${H}`}
+        style={{ width: '100%', maxWidth: W, display: 'block', margin: '0 auto' }}
+        aria-label="Mediterranean trade map"
+      >
+        {/* Sea */}
+        <rect width={W} height={H} fill="#1a2a3a" />
+
+        {/* Land */}
+        <path d={landPath} fill="#2d3b2a" stroke="#4a5a3a" strokeWidth="1" />
+
+        {/* Routes */}
+        {ROUTE_ORDER.map((routeId) => {
+          const route = ROUTES.find((r) => r.id === routeId)
+          if (!route) return null
+          const a = pts[route.from]
+          const b = pts[route.to]
+          const unlocked = chapter > route.chapter
+          return (
+            <line
+              key={routeId}
+              x1={a.x} y1={a.y}
+              x2={b.x} y2={b.y}
+              stroke={unlocked ? '#c8a96e' : '#4a5a6a'}
+              strokeWidth={unlocked ? 1.5 : 1}
+              strokeDasharray={unlocked ? undefined : '4 4'}
+              opacity={unlocked ? 0.8 : 0.35}
+            />
+          )
+        })}
+
+        {/* Waypoints */}
+        {WAYPOINT_IDS.map((id) => {
+          const wp = WAYPOINTS[id]
+          const { x, y } = pts[id]
+          const isCurrent = id === currentId
+          const isReached = WAYPOINT_IDS.indexOf(id) < chapter - 1
+          return (
+            <g key={id}>
+              {isCurrent && (
+                <circle cx={x} cy={y} r={11} fill="none" stroke="#e8c87e" strokeWidth="1" opacity="0.35" />
+              )}
+              <circle
+                cx={x} cy={y}
+                r={isCurrent ? 5 : 4}
+                fill={isCurrent ? '#e8c87e' : isReached ? '#7aab6a' : '#3a4a5a'}
+                stroke={isCurrent ? '#c8a050' : isReached ? '#5a8a4a' : '#2a3a4a'}
+                strokeWidth="1"
+              />
+              <text
+                x={x}
+                y={y - 11}
+                textAnchor="middle"
+                fontSize="10"
+                fill={isCurrent ? '#e8c87e' : isReached ? '#7aab6a' : '#5a7a8a'}
+                fontFamily="Georgia, serif"
+              >
+                {wp.latin}
+              </text>
+            </g>
+          )
+        })}
+      </svg>
+    </div>
+  )
+}