East of Campo to the Kansas state line is Comanche National Grassland and Cimarron River. Small numbers of mule deer, elk and antelope can be found here. A large population of whitetails also live in this unit. Most private ranches are leased.

Trophy class whitetails spend a lot of time in open prairie. There are a few antelope bucks and a small resident herd of elk in this unit.

Flat open prairie with rolling hills etched by long draws and Spring Canyon lead to a major drainage, Cimarron River.

Shortgrass prairie with limited cottonwood along creek bottoms, Russian olive near ranch homes, yucca, prickly cactus, some irrigated center pivot crops, large sections of dryland farming, Conservation Reserve Program land (CRP) and areas of sand sage.

Comanche National Grasslands-Carrizo Unit is about 35,000 acres located east of US Highway 287 and is framed by County Roads 42, G and J. Outfitters have leased many of the private ranches.

Springfield and Boise City, Oklahoma offer choices of motels, restaurants, gas, diesel and medical facilities. Walsh has a gas station and a small café.