You may have seen the box art from Donkey Kong Land III.
I think I may have found the location of it. This is a bit far-fetched, but I think this is the only reasonable spot in the Northern Kremisphere.
Above Cotton-Top Cove, northwest of Bramble's Bungalow. Even the mountains in the background of the box art match how K3 would be visible in the background from that boardwalk's perspective!
This would also mean that there is a mountain as large as K3 behind K3. Perhaps it's K4?