Sima Martel

Sima Martel
Sima Martel is seen in the far background, in the middle part - Sima Humboldt
Location	Venezuela, Bolívar (state), Sarisariñama
Coordinates	4°40′39″N 64°13′20″W / 4.6776°N 64.2221°W / 4.6776; -64.2221Coordinates: 4°40′39″N 64°13′20″W / 4.6776°N 64.2221°W / 4.6776; -64.2221
Depth	248 m (814 ft)
Discovery	1961
Access	By special researcher permit only

Sima Martel (Sima Menor) is an enormous sinkhole located on the summit of plateau of Sarisariñama tepui, in Bolívar State, Venezuela. It is unusual due to several factors including its enormous size and depth, location on the top of the only forested tepui and having a patch of forest on its base. Named after speleologist Édouard-Alfred Martel.

Together with the neighbouring Sima Humboldt it was first spotted in 1961 by pilot Harry Gibson.

It was first explored in 1971, and later was explored more thoroughly in 1976. In total there are four caves on Sarisariñama.