Unit 107 takes in the southeast corner of Las Animas County—high plains and canyon-rim country between Trinidad and the Oklahoma/New Mexico junction down at Branson. Elevations 4,500 to 6,000 feet. The terrain is shortgrass and sandsage prairie cut by the dramatic canyon system of the Purgatoire River and its tributaries—Carrizo, Lone Mesa, and the Picketwire. The canyons themselves are surprising: deep-cut sandstone and volcanic-rim country with cottonwood bottoms, juniper benches, and rim-rock cliffs that produce some genuinely big mule deer. The open uplands hold pronghorn; the canyon rims hold mule deer; turkey work the cottonwood riparian zones. This is some of the most overlooked, lowest-pressure mule deer country in eastern Colorado for the hunters willing to figure out the access. Comanche National Grassland is the public-land anchor here—the Carrizo Unit and the Picketwire Canyonlands together provide tens of thousands of accessible acres, with vehicle access via FS-2185 and other Grassland roads off US-160 and county routes. The rest of the unit is private deeded ranchland—legacy ground in Spanish land grant boundaries, plus modern cattle operations. US-160 runs east-west through the northern half; CO-389 and county roads drop south through Branson and Kim. Trinidad is the supply hub—gas, food, motels; Branson and Kim are gas-pump towns. Cell service is poor across most of the unit—plan for satellite or do without. Wind is relentless, the canyon-rim weather can swing hard, and the dirt roads turn to clay paste when it rains. The Picketwire dinosaur trackway is in the unit—worth a visit on a scouting trip.