The Rio Grande Basin is the watershed drained by the Rio Grande and its tributaries in Colorado, New Mexico, Texas, and Mexico.

The Rio Grande Basin, according to the Water Resources eAtlas is 98.8% dryland, 2.1% wetland, 6% urban area, 5.2% cropland of which 2.6% is irrigated cropland, 52.1% of its original forest cover has been lost -- 7.5% of the basin remains forest, 80.9% being grassland, savanna or shrubland. Except for small areas of wetland in the delta, most wetlands are near the Rio Grande in Colorado's San Luis Valley.

The waters of the Rio Grande Basin are regulated by the Rio Grande Compact Commission which carries out the provisions of the Rio Grande Compact, an interstate water compact and the International Boundary and Water Commission (IBWC), established in 1889 which applies the provisions of the water treaties between the United States and Mexico.

The watershed in Colorado, is considered separately in Rio Grande Basin in Colorado.

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