Crash Landed - Concept Art - Islands
Black Rock Island
The first island in the game. The proposed Press Kit that was in the works specifically labels it as Wumpa Island. It's unclear which name came later.
Most of this island's outside areas (and perhaps more) were built before the game was cancelled. The in-game representation looked extremely faithful to this concept art. The giant tree and the caves are evocative of the first Crash Bandicoot's middle island.
Crash would create his first inventions here, such as the Frogzooka, the Firefly Jetpack, and a hang-glider. Playable locations included the island's coast, the aforementioned giant tree, a subterranean firefly nest, and some lava caves.
There were at least two bosses in the island: a large Land Shark and the firefly hive queen. Dingodile was also going to make his first appearance at the far end of the island harassing the local bandicoots, but it's unknown if Crash would have battled him here, as he was also set to make an appearance in Crocodile Island.
Island #2
This unnamed island was a vast wasteland with a lot of canyons, tunnels, and Road Runner-esque rock formations. A giant oil refinery was built around it, dumping oil into the ocean (much like Cortex's power plant dumped toxic waste in the first game).
Crocodile Island
The third island contained a lush, tropical jungle with dense vegetation and a large swamp. Dingodile would make an appearance here burning the place down with his flamethrower.
Crocodile Island - Waterway
A concept for the third island's swamp.
Main Lab
The place where Cortex experimented with small animals, including Crash.