The volcanoes on the Central Cordillera (Royal Cordillera), east of Quito, surrounding the Guayllabamba valley, include Cotopaxi, Sincholagua, Antisana and Cayambe. Some of the volcanoes of the Western Cordillera, to the west of the Guayllabamba valley, include Illiniza, Atacazo, and Pululahua (which is the site of the Pululahua Geobotanical Reserve).