From Halopedia, the Halo wiki
Timberland is a multiplayer level originally exclusive to Halo: Combat Evolved for PC and Halo Mac. It was remade as Ridgeline in the Anniversary Map Pack for Halo: Reach and was later included in The Master Chief Collection.
It features two, two-story bases (nearly identical to those in Sidewinder, but with some subtle differences) separated by steep hills, trees and a small creek. In general the map is very symmetric, which makes Timberland one of Halo PC's best maps to play CTF or Assault.
The map has several control points and many aspects which suit it for competitive games. Along with an overshield in the middle sitting on an island in the creek, it has an active camouflage on either side and one inside the small waterfall (much like in Beaver Creek). The symmetry of Timberland makes it a balanced map. In terms of weapons with the gametype weapon settings on normal, four sniper rifles spawn, two rocket launchers, and two fuel rod guns each of these weapons spawn opposite to their counterparts with respect to the overshield in the center of the map. The level also does not have any teleporters, making for more intense gameplay.
Development for the Halo 2 Bonus Map Pack level Containment originally started off as a remake of Timberland, before Containment's design changed drastically. The map was later considered for inclusion in the Blastacular Pack before later being remade in the Anniversary Map Pack component of Halo: Reach as Ridgeline.