Elevations on the Grassland range from 3,100 to 3,700 feet (940 to 1,130 m). The terrain is mostly flat, sloping downward west to east, although bluffs rise about one hundred feet (30 m) above the valley of the Cimarron.
Vegetation is mostly shortgrass prairie grassland, dominated by sand sagebrush in salty soils. Groves of cottonwood and other trees are found near the river.
The Cimarron River flows through the grassland. From late summer through winter it is usually dry above ground. Middle Spring flows year round and beaver dams create pools of water nearby.
Point of Rocks, a large rock outcropping overlooking the Cimarron River valley, was an important landmark for travelers heading west on the Cimarron Cutoff, and for modern day ranchers, because many springs exist in the area.
Point of Rocks has an elevation of 3,540 feet (1,080 m).