| Tantalus Fossae | |
| Location: | Arcadia quadrangle |
| Coordinates: | 50.9°N -97.5°W |
| Length: | 2,400 km |
| Naming: | Classical albedo feature |
Tantalus Fossae is a group of troughs in the Arcadia quadrangle of Mars, located at 50.9° north latitude and 97.5° west longitude. They are about 2,400 km long and was named after an albedo feature at 35N, 110W. Troughs like this one are called fossae on Mars.