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Martin Helme
The Gunnison River in Black Canyon of the Gunnison National Park
- The Gunnison River is the longest river entirely within Colorado at 164 miles (264 km).
- Colorado is known as the Mother of Rivers because it holds the headwaters of the Colorado River, Arkansas River, Rio Grande, Canadian River, North Platte River, San Juan River, South Platte River, Smoky Hill River, Cimarron River, Yampa River, Gunnison River, White River, Dolores River, Laramie River, Little Snake River, Purgatoire River, Rio Chama, Cache la Poudre River, Huerfano River, Arikaree River, San Miguel River, Roaring Fork River, Animas River, Uncompahgre River, Apishapa River, Eagle River, Big Thompson River, Mancos River, Conejos River, Blue River, Piedra River, and many more.
- No point in Colorado is less than 466 miles (750 km) from the sea.
- The Continental Divide splits Colorado into a Western Slope draining to the Pacific Ocean and an Eastern Slope draining to the Atlantic Ocean.
- The waters of Colorado flow either to the Gulf of California (Mar de Cortés) via the Colorado River (Rio Colorado) or to the Gulf of Mexico (Golfo de México) via either the Mississippi River or the Rio Grande {Rio Bravo del Norte).
- The Sangre de Cristo Mountains divide the waters flowing to the Arkansas River from the waters flowing to the Rio Grande and the San Luis Closed Basin.
- Colorado has two Cimarron rivers. The eastern Cimarron River flows into the Arkansas River, while the western Cimarron River flows into the Gunnison River.
- The Rio Grande, known as the Rio Bravo del Norte in Mexico, is the longest river originating in Colorado at 1,896 miles (3,051 km).
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