The Coprates quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS) Astrogeology Research Program. The Coprates quadrangle is also referred to as MC-18 (Mars Chart-18).
The Coprates quadrangle goes from 45° to 90° west longitude and 0° to 30° south latitude on Mars. Coprates quadrangle is famous for the "Grand Canyon of Mars" named the Valles Marineris Canyon System. Signs of water exist in this quadrangle as ancient river valleys, networks of stream channels showing up as inverted terrain, and lakes inside of Valles Marineris.
Read more about Coprates Quadrangle: Valles Marineris Canyon System, Interior Layered Deposits and Sulfate, Layers, Herbes Chasma and Hydrated Deposits, Nirgal Vallis and Sapping, Inverted Relief, Vallis, Other Features in The Coprates Quadrangle