Quito is located in the northern highlands of Ecuador in the Guayllabamba river basin. The city has been built on a long plateau lying on the east flanks of the Pichincha volcano. The valley of Guayllabamba River where Quito lies is flanked by volcanoes, some of them snow capped, that can be visible from the city on a clear day. Some of the volcanoes on the Central Cordillera (Royal Cordillera), east of Quito, surrounding the Guayllabamba valley are Cotopaxi, Sincholagua, Antisana, and Cayambe. Some of the volcanoes of the Western Cordillera, to the west of the Guayllabamba valley, are Illiniza, Atacazo, Pichincha, and Pululahua (which has the Pululahua Geobotanical Reserve). Interestingly, Quito is the closest Capital City of a Country to the Equator.