Valley is a random semi-open map introduced in Age of Empires II HD: The Forgotten. The map features a valley surrounded by small foothills at the edge with a small dried up river running through the center.
There are three different environment varieties: A frozen tundra, a thick lush jungle, and an open grassy savanna. The map most often features the savanna environment with the other two occasionally appearing.
Players start out on slightly hilly grasslands near the dried up river bed near the center of the map. Consequently, the starting point for the opposing sides will be closer to each other compared to the starting position of other maps. On team matches, players share the grasslands with their teammates while the dry river valley partially bisects across the central portion of the map.
The dried up river bed features cracked clay soil unsuitable for construction. Small puddles of water are placed sporadically within the dried bed. Large herds of huntable wildlife are found scattered within the vicinity of these remaining pools of water within the dried up river. These patches of resources near the river are likely to attract attention and become contested from players of both sides as soon as the game begins.
Despite the hilly terrain, the largely open area near the dried river would render constructing defenses such as walls and towers along the map difficult to achieve and not as effective compared to other maps.
Like other special maps in the expansion, Relics will be found in the dry river beds connecting each peninsula and can provide a trickle of gold once gathered by Monks. However, Relics will be much scarcer and hard to find compared to other maps.
Deer will be found near the last puddles of water in the dried river and will be absent near the player's Town Center. Wild Boars will also be found near the river. This area may also harbor Shore Fish. Like all maps, Forage Bushes will be present near the starting location of each player where they can be gathered by Villagers. Livestock such as Sheep, Cows, or Llamas will also be provided nearby the player's Town Center.
Trees will be found in the map in style similar to Serengeti, with the majority of them scattered in small numbers throughout the map and providing less opportunities for wood. The types of trees found in the map differ depending on the environment type. In tundra version, palm trees, and snow pine trees are found thriving. In the jungle version, Jungle Trees are the dominant trees found growing. In the savanna version, Forest Trees, and Oak Trees are found in small numbers.