Coldfront
Created by LIGHTSOUT225
Coldfront is an astounding one-sided map that takes up around a quarter of Avalanche. It utilizes near the cliff side, all the way up to the first set of large man cannons. LIGHTSOUT has managed to beautifully geo-merge platforms into the side of the cliff face to create unique structures such as the defenders sniper platform and the rocket bridge which is lying over the edge of avalanche.
Of course, the rest of the map is up to this high standard as well, there are many notable features of this map, such as the "Mario Pipes", which are a pair of vertical double boxes which, when jumped into, transport you from one to the other, and push you out of the box via a grav lift.
It is these and many other little touches, as well as great gameplay, that make this one of the most beautiful, and entertaining one-sided maps to play on.