Aeolis Mensae

Aeolis Mensae is a tableland feature in the northwest Aeolis quadrangle of Mars. Its location is centered at 2.9° south latitude and 219.6° west longitude, in the transition zone between the Martian highlands and lowlands. It is 820 kilometres (510 mi) long and was named after a classical albedo feature (Aeolis). The constituent mensae can be as long as 70 kilometres (43 mi) and as tall as 2 kilometres (1.2 mi). It is notable for being the origin of an abnormal concentration of methane detected by Curiosity in 2019, although its geology has attracted scientific attention since at least a decade before this event. Aeolis Mensae is also the first region in Mars where submarine cyclic steps, an erosion feature that gives evidence of an ancient ocean, were identified.