The Sarisariñama tepui is situated in the Jaua-Sarisariñama National Park at the far south-west of Venezuela, near the border to Brazil. The summit area of Sarisariñama tepui covers 546.88 km² and its slope area 482 km². The Sarisariñama is well known for its enormous sinkholes. Two of them, Sima Humboldt and Sima Martel are visually huge, with a isolated forest ecosystem covering their bottoms. The largest is Sima Humboldt (352 m wide / 314 m deep). Sima Martel is 248 m deep.
Venezuela 1982, Sarisariñama.
Sima Humboldt in the middle part of picture and Sima Martel in the far background..
The stamp was issued in the series "50th Anniversary Natural Science Society".