Unit 137 covers the country around Stonewall and the upper Purgatoire River headwaters in northern Las Animas County—the eastern slopes of the Culebra Range and the high country south of Cuchara Pass. Elevations climb from about 7,000 feet in the Purgatoire valley bottom to 11,000 feet on the higher Culebra ridges, and reach over 13,000 on the Culebra crest along the Costilla County line. The terrain is dramatic high-country with deep north-south drainages, dense Gambel oakbrush in the lower-elevation transition zone, ponderosa pine with aspen on the mid-slopes, mixed conifer (Douglas fir, blue spruce) and dark spruce-fir on the higher north-facing aspects, and alpine tundra on the highest ridgelines. The country is overlooked compared to the more famous Sangre de Cristo units to the north—and it shouldn't be. Mule deer grow real here, elk numbers are solid, black bear is excellent, and the rare Rocky Mountain bighorn (transplant herd) has held in the high crags. San Isabel National Forest covers the higher elevations with the Spanish Peaks Wilderness on the northern boundary; the Culebra Range itself transitions into private (the famous Cielo Vista Ranch / Taylor Ranch on the west side, accessible only by purchased permit). The eastern half of 137 is significant private deeded ranch ground with legacy land grant boundaries. CO-12 (Highway of Legends) is the paved access through Stonewall and Cuchara Pass; FS roads branch off into the high country (rough 4WD). Stonewall is a tiny community with limited services; Cuchara has cabins and a small store; Trinidad is the supply hub. Cell service is poor across the unit. October weather can dump snow that closes the pass; come prepared.