The Jaua-Sarisariñama National Park in Bolívar State, Venezuela, holds one of the planet’s most compelling and mysterious geological secrets, the sinkholes of the Sarisariñama tepui. These formations, including the Sima Humboldt and Sima Martel, challenge conventional understanding of geology and harbor isolated worlds within their depths.
The sinkholes are not carved from soft limestone, like typical karst features. Instead, they pierce the incredibly durable, hard quartz arenite rock of the tepui’s flat summit. It is the slow, relentless erosion by water over countless millennia that formed these immense chasms—a process that seems counterintuitive given the rock’s characteristic toughness. This anomaly makes the Sarisariñama sinkholes a truly unique spectacle of nature’s subtle power.
Situated on the tepui’s plateau, which is itself blanketed by a dense, vibrant forest canopy reaching heights of 15 to 25 meters, the sinkholes plunge hundreds of feet downward. At the bottom lies an entirely separate, isolated forest ecosystem. These unique environments have evolved their own distinct flora and fauna, making them priceless natural laboratories. So far, only four of these gigantic pits have been located on the mountain.
The existence of these geological wonders remained a secret to the outside world until 1961, when pilot Harry Gibson first spotted the two largest holes from the air. Due to their location in one of the most remote regions on Earth, the Sarisariñama tepui is notoriously difficult to access. While a helicopter remains the most practical means of reaching the location, adventurous explorers have also reached the place via canoe with persistent local guides.
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