The Utility Base is an Arena-Style map surrounded by a lush forest. The map has undergone several changes over the years, including the removal of a small river, plains and the change from a Jungle style-forest to a Redwood Forest. It seems to be a fan favorite.
The centerpiece of the map is the utility base for which it is named after; this base is located in the middle of the map and is surrounded by walls. Dinosaurs like the Dilosaurus and Novaraptor can enter the base by jumping over the walls or onto the rocks near the walls, while the T.Rex can only enter the compound through the two main entrances, with the exception of a specific rock. Outside the base is just a forest with heavy foliage, trees, and rocks.
Many humans tend to hide in the central building, which can be seen in the picture above, because the T.Rex cannot fit inside the building. In the recode, however, the T.Rex may be resized and will then be able to fit inside the building.
Both humans and dinosaurs spawn in the forest; they never spawn inside the base.