The Cordillera Quimsa Cruz is a mountain range in the La Paz Department in Bolivia situated south east of Lake Titicaca and north of Lake Uru Uru, measuring about 35–40 km in length and 12 km at its widest point.

The Cordillera Real is a mountain range in the Bolivian Andes. It divides the lowlands of the Amazon basin from the high plateaus of the Altiplano.

Coroico is a town in Nor Yungas Province, in the La Paz Department of western Bolivia.

Artvin Province is a province in Turkey, on the Black Sea coast in the northeastern corner of the country, on the border with Georgia. The provincial capital is the city of Artvin.

Cotacachi Cayapas Reserve contains 752,235 acres (3,044 km2) of land and is located in the Imbabura and Esmeraldas provinces of Ecuador 87 miles (140 km) from Quito.

Cotopaxi is an active stratovolcano in the Andes Mountains, located in the Latacunga canton of Cotopaxi Province, about 50 km (31 mi) south of Quito, and 33 km (21 mi) northeast of the city of Latacunga, Ecuador, in South America.

Clare is a county in western Ireland with terrain ranging from rolling countryside to craggy Atlantic coastline. The Burren, a uniquely rocky wilderness area, shelters Stone Age monuments and ancient churches, and atop the 213m-high Cliffs of Moher.

Croagh Patrick, nicknamed the Reek, is a 764 m mountain and an important site of pilgrimage in Mayo, Ireland. It is 8 km from Westport, above the villages of Murrisk and Lecanvey.

The Curonian Spit is a 98-kilometre long, thin, curved sand-dune spit that separates the Curonian Lagoon from the Baltic Sea coast. Its southern portion lies within Kaliningrad Oblast, Russia and its northern within southwestern Klaipėda County.

The Cyclades are an island group in the Aegean Sea, southeast of mainland Greece and a former administrative prefecture of Greece. They are one of the island groups which constitute the Aegean archipelago.