A topo study of the crater ocean area.
1. I was thinking a 100m difference between yellow and green, but only a 10m or less between greens, and yellow browns.
2. Think massive waterfalls on the edge of the large crater, flowing down into lush tropical forests below.
3. Think temperate (north america) climate for the yellow and higher altitudes, giving way to oak trees, aspen forests, etc, and very hot and dense jungles below...this continent is near the equator, and at the crosspoints of several major weather patterns on the planet.