Karst, as defined in its Wikipedia entry:
a topography formed from the dissolution of soluble carbonate rocks such as limestone and dolomite. It is characterized by features like poljes above and drainage systems with sinkholes and caves underground.
Much of Raja Ampat – including more than one thousand of its small islands, isles and islets – is karst.
The soluble nature of the relevant rock is often unmistakably evident.
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