Baetis Chasma (Mars)
From classical albedo feature at 5S, 60W; changed from Iamunae Chasma.
A chasma is a deep, elongated, steep-sided depression. On Mars they are named after the nearest named albedo feature on the Schiaparelli or Antoniadi maps.
Baetis Chasma
-4.29° N 295.13° E