What I don't understand is that if the crater in the first pic in the first post is all land, shouldn't it be mostly just a giant lake, not some
kind of grassland or mountain whatever its showing. After all, is it really that old, that clumps of land fills up in the crater?
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It's over 200 million years old. 
It used to be a couple of lakes and some rivers but the government built hydro dams and the circle with the island was the end result.
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 Originally posted by deltaboy
What I don't understand is that if the crater in the first pic in the first post is all land, shouldn't it be mostly just a giant lake, not some
kind of grassland or mountain whatever its showing.  Some of the rocks cooled from impact melt are quite hard so impact melt could have formed
harder formation to lowest part of crater which resisted erosion better leading to outer/higher areas inside crater bowl to erode faster.
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Here's what the area looked like before the hydro dams were built.
external image
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