I have been working on my CC3 for the longest time and it has helped me for so long. However, I am nearing the end of my rope on a certain land type.

I have asked about deserts, canyonloands, and even small regions. For the first time, I am dealing in an area I just cannot seem to get the land right.
Some of you know that I write short stories for personal enjoyment as well as an extremely limited audience. I draw these maps so I can set my story correctly.

In this latest story, I am dealing with a limestone jungle location. A fairly large location with natural canals, large jungle trees, and a few islands to say the lest. Think of the region as a larger location of RE (Real Earth) Ha Long Bay.
Since limestone is originally a coral reef, I can't think of a prominent shape.

My question is this:
What is the best overall shape for a limestone jungle prior to erosion? And what shape would it be after 4,000 years of erosion?