 | This article needs additional citations for verification. (April 2019) |
| Disputed reef | |
|---|---|
 Satellite image of Banc du Geyser (center) with Mayotte (left), the Glorioso Islands (top right) and Madagascar (bottom right) | |
  Banc du Geyser | |
| Other names | Banc du Geysir, Arecife de Santo Antonio |
| Geography | |
| Location | Mozambique Channel |
| Coordinates | 12°19′12″S 46°27′00″E / 12.32000°S 46.45000°E |
| Archipelago | Comoro Islands |
| Length | 8 km (5 mi)(low tide only) |
| Width | 5 km (3.1 mi)(low tide only) |
| Highest elevation | 8 m (26 ft) |
| Highest point | South Rock |
| Administration | |
| Claimed by | |
| Demographics | |
| Population | 0 |
Banc du Geyser (also Banc du Geysir) is a mostly submerged reef in the Mozambique Channel's northeastern part, 125 km (78 mi) northeast from Mayotte, 112 km (70 mi) southwest of the Glorioso Islands and 200 km (124 mi) off the northwestern coast of Madagascar.