How many chasmata are there on Mars?

25 features on Mars carry the IAU descriptor Chasma, out of 2,049 named places on the world.

What does Chasma mean in planetary nomenclature?

Chasma is the IAU descriptor term for a deep, steep-sided canyon. It is used on 2 of the mapped worlds, for 88 named features in total.

Capri Chasma, 1,472 km across — 21.7% of Mars's own diameter. Classical albedo feature name.

The IAU draws these names from 2 categories: Greek (13), Latin (12).

25 named features carry the IAU descriptor Chasma — a deep, steep-sided canyon on Mars, out of 88 in the mapped Solar System.

Named

of 2,049 named places on Mars — 1.2%

Largest

1,472 km

Capri Chasma

Median size

317 km

Across the 25 with a measured diameter

Named between

1973–2015

IAU approval dates

The IAU assigns each feature class on each world a naming theme. Across the 25 chasmata with a recorded origin, 2 categories appear, led by Greek.

Greek13Latin12

The same descriptor is used on 1 other world, for 63 more features.