diff --git a/data/scenarios/Testing/00-ORDER.txt b/data/scenarios/Testing/00-ORDER.txt
index e7edbda40..c662b7c16 100644
--- a/data/scenarios/Testing/00-ORDER.txt
+++ b/data/scenarios/Testing/00-ORDER.txt
@@ -36,6 +36,7 @@ Achievements
 1218-stride-command.yaml
 1234-push-command.yaml
 1256-halt-command.yaml
+1271-wall-boundaries.yaml
 1262-display-device-commands.yaml
 1295-density-command.yaml
 1138-structures
diff --git a/data/scenarios/Testing/1271-wall-boundaries.yaml b/data/scenarios/Testing/1271-wall-boundaries.yaml
new file mode 100644
index 000000000..824421317
--- /dev/null
+++ b/data/scenarios/Testing/1271-wall-boundaries.yaml
@@ -0,0 +1,48 @@
+version: 1
+name: Wall boundaries
+creative: false
+description: Stop a robot using halt
+objectives:
+  - goal:
+      - Just be.
+    condition: |
+      return false;
+solution: |
+  noop;
+robots:
+  - name: base
+    dir: [0,-1]
+    display:
+      char: Ω
+      attr: robot
+    devices:
+      - compass
+      - dictionary
+      - grabber
+      - toolkit
+      - logger
+      - tank treads
+      - antenna
+      - ADT calculator
+entities:
+  - name: wall
+    display:
+      char: 'x'
+    description:
+      - A wall
+    properties: [known, boundary]
+world:
+  default: [blank]
+  palette:
+    'Ω': [grass, null, base]
+    '.': [grass]
+    '#': [grass, wall]
+  upperleft: [0, 0]
+  map: |
+    Ω.......
+    ....#...
+    ..####..
+    ..#.##..
+    ..#..#..
+    ..####..
+    ........
diff --git a/src/swarm-scenario/Swarm/Game/Entity.hs b/src/swarm-scenario/Swarm/Game/Entity.hs
index be48eb57a..b187f6ff7 100644
--- a/src/swarm-scenario/Swarm/Game/Entity.hs
+++ b/src/swarm-scenario/Swarm/Game/Entity.hs
@@ -157,6 +157,8 @@ data EntityProperty
     Pushable
   | -- | Obstructs the view of robots that attempt to "scout"
     Opaque
+  | -- | Is automatically rendered as a contiguous border
+    Boundary
   | -- | Regrows from a seed after it is harvested.
     Growable
   | -- | Can burn when ignited (either via 'Swarm.Language.Syntax.Ignite' or by
diff --git a/src/swarm-tui/Swarm/TUI/View.hs b/src/swarm-tui/Swarm/TUI/View.hs
index b5df6bb24..f9d55d28d 100644
--- a/src/swarm-tui/Swarm/TUI/View.hs
+++ b/src/swarm-tui/Swarm/TUI/View.hs
@@ -1103,6 +1103,7 @@ displayProperties = displayList . mapMaybe showProperty
   showProperty Liquid = Just "liquid"
   showProperty Unwalkable = Just "blocking"
   showProperty Opaque = Just "opaque"
+  showProperty Boundary = Just "boundary"
   -- Most things are pickable so we don't show that.
   showProperty Pickable = Nothing
   -- 'Known' is just a technical detail of how we handle some entities