diff --git a/web/src/screens/minimap.ts b/web/src/screens/minimap.ts
index 81769ee..9829344 100644
--- a/web/src/screens/minimap.ts
+++ b/web/src/screens/minimap.ts
@@ -12,12 +12,16 @@
  *
  * One hue, value carrying a fixed importance order:
  *
- *     low ground -> high ground -> woods -> water -> roads -> buildings
+ *     water -> low ground -> high ground -> buildings -> woods -> roads
  *     darkest ------------------------------------------------> lightest
  *
- * so it survives being 200 pixels wide, and survives colour blindness. The two
- * darkest values are the card's own board colours, so the tile sits in the card
- * rather than on it.
+ * The order is by what is rare rather than by what is important, because a
+ * board made mostly of one thing has to read as ground with markings on it and
+ * not as a block. Archipelago is half water and Downtown Arbitration is most
+ * of the way to solid buildings; both were coming out as a bright slab with
+ * the land drawn on top. Water is a hole in the ground and a city block is a
+ * thing standing on it, so both go dark and the streets between them light -
+ * which is what a city looks like from above anyway.
  *
  * so it survives being 200 pixels wide, and survives colour blindness. The two
  * darkest values are the card's own board colours, so the tile sits in the card
@@ -45,13 +49,14 @@ const LEVELS = "abcdefghijklmnopqrs";
 
 const INK = {
   ground: "#0b1017",
+  low: "#0f1622",
   grid: "#172134",
   high: "#22314b",
   woods: "#2f5f86",
-  water: "#3b82c4",
+  water: "#1e4468",
   edge: "#63a6de",
   road: "#8fb6d9",
-  building: "#cfe2f2",
+  building: "#3d4d69",
 };
 
 /**
@@ -120,7 +125,9 @@ export function drawMinimap(
   };
 
   // Ground first, banded against the board's own median so a board that sits
-  // entirely at level 2 reads as flat rather than as a plateau.
+  // entirely at level 2 reads as flat rather than as a plateau. Three bands
+  // and not two: Sinkhole's one feature is a hole, and against a high/flat
+  // pair a hole is indistinguishable from open ground.
   const allLevels = sheets.flatMap((s) =>
     [...s.l].map((c) => LEVELS.indexOf(c) - 9),
   );
@@ -145,7 +152,8 @@ export function drawMinimap(
         const kind = sheet.t[n]!;
         const level = LEVELS.indexOf(sheet.l[n]!) - 9;
         const { cx, cy } = at(i, x, y);
-        let fill = level > median ? INK.high : INK.grid;
+        let fill =
+          level > median ? INK.high : level < median ? INK.low : INK.grid;
         if (kind === "w" || kind === "W") fill = INK.woods;
         else if (kind === "~") fill = INK.water;
         else if (kind === "=") fill = INK.road;