Mystaran Campaign: The Great Crater continuous ejecta deposit

The edge of this plateau of boulders is around 116 feet high rising several thousand feet at the crater rim. As this is a deposit layer, the existing landscape, even up in the mountains at 18,000 has upward of a thousand feet of new rock. It pretty much extends to the subsidance of the caverns of the shadow elves.
Accessibility to the crater would in the aftermath be via the lowest point on the plateau, which is where it dips below the mostly drained Lake Amsorak creating a bay.