diff --git a/changelog.d/1694-cctv-globe-plane-clamp.md b/changelog.d/1694-cctv-globe-plane-clamp.md
new file mode 100644
index 000000000..54adb8545
--- /dev/null
+++ b/changelog.d/1694-cctv-globe-plane-clamp.md
@@ -0,0 +1,3 @@
+- End a CCTV camera's monitor plane where its view meets the ground on globe
+  maps too, instead of a kilometre-wide plane hundreds of metres up
+  (samehkhamis, #1694).
diff --git a/docs/CURRENT-STATE.md b/docs/CURRENT-STATE.md
index 0d0e26f00..1de6c550d 100644
--- a/docs/CURRENT-STATE.md
+++ b/docs/CURRENT-STATE.md
@@ -6572,6 +6572,10 @@ silently demoting every later lookup for the session.
   far cap, retargeting the existing video/canvas texture pipeline. Stills are drawn at their source aspect, centered on the placeholder dark (`#01070c`), instead of being stretched to the 16:9 canvas. Manual calibration only —
   auto-calibration and the drape mesh pipeline are deleted. A one-shot activation obstruction
   probe (`pickFromRay` on camera activation, clamping the plane short of the first hit) remains;
+  a hit at or beyond the camera's range counts as a miss, and on a globe map the plane also clamps
+  short of the globe's terrain along the axis (flat ground at the mount's ground when terrain is
+  missed or met beyond the range), whichever is nearer, so it never stands at the full range there
+  (about a kilometre wide and hundreds of metres up);
   ground placement is superseded by the shared-floor v3 behavior below. Calibration persists to
   `godsEyeView.cctv.calibration.v2` (wiped clean, no v1 import); a panel-only CAL badge shows
   `CALIBRATED`/`CURATED`/`RAW PRIOR` (no in-world tint). Panel is titled "CCTV" (not "CCTV
diff --git a/src/data/cctv.js b/src/data/cctv.js
index ed3f56654..884638a96 100644
--- a/src/data/cctv.js
+++ b/src/data/cctv.js
@@ -29,6 +29,7 @@ export const writeCalibrationStoreV2 = layer.writeCalibrationStoreV2;
 export const deriveCalBadge = layer.deriveCalBadge;
 export const computeFrustumGeometry = layer.computeFrustumGeometry;
 export const activationProbeClampRange = layer.activationProbeClampRange;
+export const flatGroundAxisDistance = layer.flatGroundAxisDistance;
 export const frameSignatureFromPixels = layer.frameSignatureFromPixels;
 export const _createCctvProjectionPlaneForTest =
   layer._createCctvProjectionPlaneForTest;
diff --git a/src/data/cctv.test.mjs b/src/data/cctv.test.mjs
index bcd5c48ab..087422584 100644
--- a/src/data/cctv.test.mjs
+++ b/src/data/cctv.test.mjs
@@ -35,6 +35,7 @@ import cctvLayer, {
   _pushAmbientCardEntriesForTest,
   _setCctvOverlayHostForTest,
   activationProbeClampRange,
+  flatGroundAxisDistance,
   bindCctvWorldClickGesture,
   clearProbeClampOnDeactivation,
   computeFrustumGeometry,
@@ -655,6 +656,17 @@ test('activation obstruction clamp uses the field-derived 12 m floor', () => {
   assert.equal(activationProbeClampRange(210, 250), null);
 });
 
+test('on a globe map the axis ends on flat ground at the mount ground', () => {
+  // A 24 m mount pitched 30° down meets the ground 48 m along its axis.
+  assert.ok(Math.abs(flatGroundAxisDistance(24, -30) - 48) < 1e-9);
+  // The default 700 m range then clamps just short of that, not 700 m out.
+  const clamp = activationProbeClampRange(700, flatGroundAxisDistance(24, -30));
+  assert.ok(Math.abs(clamp - 44) < 1e-9);
+  assert.equal(flatGroundAxisDistance(24, 0), null);
+  assert.equal(flatGroundAxisDistance(24, 10), null);
+  assert.equal(flatGroundAxisDistance(0, -30), null);
+});
+
 test('deactivation clears the probe clamp and restores nominal frustum geometry', () => {
   const record = {
     camera: { ...UNCLAMPED_CAMERA },
diff --git a/src/layers/cctv/geometry.js b/src/layers/cctv/geometry.js
index a1402c6c2..148c4a253 100644
--- a/src/layers/cctv/geometry.js
+++ b/src/layers/cctv/geometry.js
@@ -260,6 +260,21 @@ export function createGeometry({ state: layerState, services, parts, source }) {
     return Math.max(PROBE_MIN_RANGE_M, hitDistance - PROBE_CLEARANCE_M);
   }
 
+  /**
+   * Distance along a pitched-down view axis to flat ground at the mount's own
+   * ground height, or null for an axis at or above the horizon.
+   * @param {number} mountHeightM Mount height above its ground.
+   * @param {number} pitchDeg Axis pitch (negative looks down).
+   * @returns {number|null}
+   */
+
+  function flatGroundAxisDistance(mountHeightM, pitchDeg) {
+    const height = Number(mountHeightM);
+    const pitch = Number(pitchDeg);
+    if (!Number.isFinite(height) || height <= 0 || !(pitch < 0)) return null;
+    return height / Math.sin(Cesium.Math.toRadians(Math.min(89, -pitch)));
+  }
+
   /**
    * Converts a computeFrustumGeometry result into the Cartesian3 positions the
    * entities consume. Fresh objects per call (geometry updates are rare —
@@ -616,10 +631,14 @@ export function createGeometry({ state: layerState, services, parts, source }) {
    * range, clamp the plane's effective range just short of the first hit so the
    * "big and dramatic" true end cap never clips into downtown buildings.
    *
-   * This is the ONLY raycast in the whole CCTV subsystem — once per activation,
-   * never per-frame (the zero-raycast invariant applies to steady state). The
-   * per-camera range slider overrides the clamp: a user-set rangeScale skips the
-   * probe entirely. Probe failure/miss keeps the unclamped range.
+   * On a globe map it also picks the globe's terrain along the same axis
+   * (flat ground at the mount's ground when terrain is missed or met beyond
+   * the range) and clamps at the nearer end. These are the ONLY raycasts in the
+   * whole CCTV subsystem — once per activation, never per-frame (the
+   * zero-raycast invariant applies to steady state). The per-camera range
+   * slider overrides the clamp: a user-set rangeScale skips the probe
+   * entirely. A miss on the photoreal stack or a probe failure keeps the
+   * unclamped range.
    * @param {Object} record - Camera record being activated.
    */
 
@@ -646,9 +665,33 @@ export function createGeometry({ state: layerState, services, parts, source }) {
       for (const runtime of layerState._projectionEntities) {
         if (runtime?.planeEntity) exclude.push(runtime.planeEntity);
       }
-      const hit = scene.pickFromRay(new Cesium.Ray(mountPos, dir), exclude);
-      if (!hit?.position) return;
-      const dist = Cesium.Cartesian3.distance(mountPos, hit.position);
+      const ray = new Cesium.Ray(mountPos, dir);
+      // pickFromRay hits only primitives (the photoreal tiles), never the
+      // globe: on a globe map the ray runs on through the Earth and can meet
+      // a primitive thousands of kilometres away, which blocks nothing. Such
+      // a hit or none left the plane at the full nominal range, about a
+      // kilometre wide and hundreds of metres up. A hit at or beyond the range
+      // counts as none. On a globe map the axis also ends on the globe's
+      // terrain, the nearer of that and any primitive hit (a primitive behind
+      // a hill the axis has already entered blocks nothing). Terrain still
+      // loading at a coarse level can be missed or met beyond the range; then
+      // flat ground at the mount's own ground stands in for it.
+      const inRange = (distance) =>
+        Number.isFinite(distance) && distance > 0 && distance < camera.rangeM;
+      const hit = scene.pickFromRay(ray, exclude)?.position;
+      const hitDist = hit ? Cesium.Cartesian3.distance(mountPos, hit) : NaN;
+      const distances = inRange(hitDist) ? [hitDist] : [];
+      if (scene.globe?.show) {
+        const terrain = scene.globe.pick(ray, scene);
+        const terrainDist = terrain
+          ? Cesium.Cartesian3.distance(mountPos, terrain)
+          : NaN;
+        const ground = inRange(terrainDist)
+          ? terrainDist
+          : flatGroundAxisDistance(camera.mountHeightM, camera.pitchDeg);
+        if (Number.isFinite(ground) && ground > 0) distances.push(ground);
+      }
+      const dist = distances.length ? Math.min(...distances) : null;
       record.probeClampRangeM = activationProbeClampRange(camera.rangeM, dist);
     } catch {
       // probe failure → keep the unclamped range
@@ -831,6 +874,7 @@ export function createGeometry({ state: layerState, services, parts, source }) {
     hasShippedFootprint,
     footprintPose,
     activationProbeClampRange,
+    flatGroundAxisDistance,
     frustumCartesians,
     frustumFrameEcef,
     applyFrustumGeometry,
diff --git a/src/layers/cctv/index.js b/src/layers/cctv/index.js
index 36e1360b4..ba251da34 100644
--- a/src/layers/cctv/index.js
+++ b/src/layers/cctv/index.js
@@ -73,6 +73,7 @@ export function createCctvLayer({ services, source }) {
       deriveCalBadge: parts.calibration.deriveCalBadge,
       computeFrustumGeometry: parts.geometry.computeFrustumGeometry,
       activationProbeClampRange: parts.geometry.activationProbeClampRange,
+      flatGroundAxisDistance: parts.geometry.flatGroundAxisDistance,
       frameSignatureFromPixels: parts.frames.frameSignatureFromPixels,
       _createCctvProjectionPlaneForTest:
         parts.testing._createCctvProjectionPlaneForTest,