Amazing feature of the unique Aouk Underground River is narrow, deep hole through the rainforest and deep in the ground – Keek sinkhole.

This deep sinkhole in the Arfak Mountains was formed when the ceiling of a cave above the Aouk Underground River collapsed. This hole is some 150 m long and 110 m wide, approximately 160 – 180 m deep. The sinkhole is bell-shaped – below it is wider, but its mouth above is more narrow – just 100 by 60 m wide. Its volume is approximately 1.4 million m3.

The size of this sinkhole exceeds 100 m and also the depth exceeds 100 m – thus Keek sinkhole can be considered to be a true tiankeng.

The whole floor of this sinkhole is just a fast river – this hole in the ground is a window to the underground stream of Aouk. The stream of Aouk comes from the south after passing through some 1.7 km long underground passage from Wakut – the gloomy entrance in Aouk Underground River.

Nearby are two more giant sinkholes: Hafasu Tiankeng and Kuom Tiankeng.


  1. Papua 2017 Aouk Underground River – Acheloos Geo Exploring, Petzl. Accessed in 14 January, 2019
  2. Andrea Benassi e Ivan Vicenzi, Papua 2017 Aouk Underground River – Acheloos Geo Exploring, cronache ipogee. Accessed in 16 January, 2019
  3. Il Tiankeng dell’Aouk, Speleologia Casolana. Accessed in 16 January, 2019
  4. Graham Mullan, News: Exploring Large River Caves in West Papua, Darkness Below. Accessed in 16 January, 2019
Keek Tiankeng on the map
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Location, GPS coordinates: 0.9527 S 132.3372 E
Categories: Sinkholes
Values: Geology, Visual
Rating: 3 out of 10 stars
Where is located? Asia, Indonesia, Western New Guinea, southern part of Tambrauw Regency, Aouk Underground River
Alternate name: Keek
Depth: approximately 180 m
Volume: 1.4 million m³

Landmarks of Indonesia

Kelimutu crater lakes, Flores
Kelimutu crater lakes, Flores / H. Hansson, Wikimedia Commons / CC-BY-SA-3.0
Indonesia is a true land of wonders. There are few other countries in the world which can offer similar array of diverse, unique and beautiful natural and cultural monuments.


Great Blue Hole, Belize
Great Blue Hole / Eric Pheterson, / CC BY 2.0
Category includes outstanding sinkholes – large natural depressions or holes, which for most part represent collapsed caves.

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