Shank and Chaos' stage is Shank's Maze. The stage just like in PR 1 is a crumbling and decaying city. The stage however is on a highway that has been destroyed and the rest of the highway can be seen in the background. Crumbling skyscrapers can also be seen as well as other buildings in this city. It is unknown if this is the exact same stage as The Ruins from PR 1. Other bridges can be seen destroyed in the background on the left. The sky is yellow kind of like if the sun was setting.
How Shank's Maze looks in game.
All information here was stuff I had come up with. All Primal Rage 2 information especially images have been brought up by me. Gruntzilla94 2016