The geography of the U.S. State of Colorado is diverse, encompassing both rugged mountainous terrain, vast plains, desert lands, desert canyons, and mesas. Colorado is a landlocked U.S. state. In 1861, the United States Congress defined the boundaries of the new Territory of Colorado exclusively by lines of latitude and longitude, stretching from 37°N to 41°N latitude, and from 102°02'48"W to 109°02'48"W longitude. Starting in 1868, official surveys demarcated the boundaries, deviating from the parallels and meridians in several places. Later surveys attempted to correct some of these mistakes but in 1925 the U.S. Supreme Court affirmed that the earlier demarcation was the official boundary. The borders of Colorado are now officially defined by 697 boundary markers connected by straight boundary lines. Colorado, Wyoming, and Utah are the only states that have their borders defined solely by straight boundary lines with no natural features. The southwest corner of Colorado is the Four Corners Monument at 36°59'56"N, 109°2'43"W. This is the only place in the United States where four states meet: Colorado, New Mexico, Arizona, and Utah.
Little Bear Peak is a high mountain summit in the Sangre de Cristo Range of the Rocky Mountains of North America. The 14,043-foot (4,280 m) fourteener is located on the Sierra Blanca Massif, 8.8 miles (14.2 km) north by east of the Town of Blanca, Colorado, United States, on the drainage divide separating Rio Grande National Forest and Alamosa County from the Sangre de Cristo Land Grant and Costilla County. Little Bear lies 0.96 miles (1.54 km) southwest of Blanca Peak, the ultra prominent fourteener that is the highest point of the massif.
Stewart Peak, elevation 13,983 ft (4,262 m), is a summit in Colorado. The peak is the second highest thirteener in the state. It is located in the La Garita Mountains, sub-range of the San Juan Mountains, in Saguache County, within the La Garita Wilderness. Stewart Peak is the 55th highest peak in Colorado by most standard definitions, just missing the list of Colorado fourteeners. At one time, the peak's elevation was measured to be over 14,000 ft and it was believed to be a fourteener, but more recent and accurate surveys have dropped it below that threshold.
Methodist Mountain is a mountain summit in the northern Sangre de Cristo Range of the Rocky Mountains of North America. The 11,713-foot (3,570 m) peak is located 5.5 miles (8.8 km) south by west of the City of Salida, Colorado, United States, on the drainage divide separating San Isabel National Forest and Chaffee County from Rio Grande National Forest and Saguache County. Methodist Mountain is the northernmost peak of the Sangre de Cristo Mountains, which stretch south through southern Colorado to Santa Fe, New Mexico.
Conejos Peak is a high and prominent mountain summit in the southern San Juan Mountains of the Rocky Mountains of North America. The 13,179-foot (4,017 m) thirteener is located in the South San Juan Wilderness of Rio Grande National Forest, 19.6 miles (31.6 km) north-northwest of Cumbres Pass in Conejos County, Colorado, United States. The summit of Conejos Peak is the highest point in Conejos County.
For the mountain in California formerly named Summit Peak, see Mount Ina Coolbrith.
South River Peak, elevation 13,154 ft (4,009 m), is a summit in the San Juan Mountains of southwestern Colorado, United States. The mountain is in the Weminuche Wilderness of Rio Grande National Forest.
Mount Oso is a high and prominent mountain summit in the San Juan Mountains range of the Rocky Mountains of North America. The 13,690-foot (4,173 m) peak is located in the Weminuche Wilderness of San Juan National Forest, 30.8 miles (49.5 km) northeast of the City of Durango in La Plata County, Colorado, United States.
Antora Peak is a high and prominent mountain summit in the southern Sawatch Range of the Rocky Mountains of North America. The 13,275-foot (4,046 m) thirteener is located in Rio Grande National Forest, 4.6 miles (7.4 km) west-northwest of the Town of Bonanza in Saguache County, Colorado, United States.
Bennett Peak is a high and prominent mountain summit in the San Juan Mountains range of the Rocky Mountains System, in southwestern Colorado.
Middle Peak is a high and prominent mountain summit in the San Miguel Mountains range of the Rocky Mountains of North America. The 13,306-foot (4,056 m) peak is located in the Lizard Head Wilderness, 17.1 miles (27.6 km) west-southwest of the Town of Telluride, Colorado, United States, on the drainage divide separating San Juan National Forest and Dolores County from Uncompahgre National Forest and San Miguel County.
Bushnell Peak is a prominent mountain summit in the Sangre de Cristo Range of the Rocky Mountains of North America. The 13,110-foot (3,996 m) thirteener is located 7.2 miles (11.6 km) north-northeast of the community of Villa Grove, Colorado, United States, on the drainage divide separating Rio Grande National Forest and Saguache County from San Isabel National Forest and Fremont County. Bushnell Peak is the highest point in Fremont County.
Horse Mountain is a prominent mountain summit in the San Juan Mountains range of the Rocky Mountains of North America. The 9,952-foot (3,033 m) peak is located in San Juan National Forest, 15.8 miles (25.5 km) west by north of the Town of Pagosa Springs in Archuleta County, Colorado, United States.
Lone Cone is a prominent mountain summit at the western end of the San Miguel Mountains range of the Rocky Mountains of North America. The 12,618-foot (3,846 m) peak is located 24.2 miles (38.9 km) west by south of the Town of Telluride, Colorado, United States, on the drainage divide separating San Juan National Forest and Dolores County from Uncompahgre National Forest and San Miguel County.
Mount Zwischen is a prominent mountain summit in the Sangre de Cristo Range of the Rocky Mountains of North America. The 12,011-foot (3,661 m) peak is located 32.1 miles (51.6 km) northeast of the City of Alamosa, Colorado, United States, on the drainage divide separating the Great Sand Dunes Wilderness in Great Sand Dunes National Preserve and Huerfano County from the Sangre de Cristo Wilderness in San Isabel National Forest and Saguache County.
Arrow Peak is a high mountain summit in the Grenadier Range of the Rocky Mountains of North America. The 13,809-foot (4,209 m) thirteener is located in the Weminuche Wilderness of San Juan National Forest, 8.7 miles (14.0 km) south-southeast of the Town of Silverton in San Juan County, Colorado, United States.
California Peak is a high mountain summit in the Sangre de Cristo Range of the Rocky Mountains of North America. The 13,855-foot (4,223 m) thirteener is located on the Sierra Blanca Massif, 12.1 miles (19.5 km) north of the Town of Blanca, Colorado, United States, on the drainage divide separating in Rio Grande National Forest and Alamosa County from San Isabel National Forest and Huerfano County.
Half Peak is the highest summit of the east central San Juan Mountains in the Rocky Mountains of North America.
Rito Alto Peak, elevation 13,803 ft (4,207 m), is a summit in the Sangre de Cristo Range of south central Colorado. The peak is 11 mi (18 km) west of Westcliffe in the Rio Grande and San Isabel national forests.
