Chupio.—Lat. 19° 10', long. 101° 27', elev. 1080 m. A village 12 kilometers by road south of Tacámbaro; transition between arid tropical scrub forest and oak forest.
Churumuco.—Lat. 18° 37', long. 101° 38', elev. 210 m. A small town in the Balsas Valley; arid tropical scrub forest.
Ciénega (La).—Lat. 18° 28', long. 103° 18', elev. 900 m. A ranch about 3 hours by mule north of Coire; tropical semi-deciduous forest.
Coahuayana.—Lat. 18° 44', long. 103° 31', elev. 15 m. A village on the coastal plain near the mouth of the Río Coahuayana; arid tropical scrub forest and tropical semi-deciduous forest.
Coalcomán.—Lat. 18° 47', long. 103° 08', elev. 945 m. The largest town in the Sierra de Coalcomán and situated in a valley about 12 by 6 kilometers; arid tropical scrub forest on valley floor; oaks and some tropical semi-deciduous forest on surrounding slopes.
Coalcomán (Río).—A river having its headwaters northeast of the town of Coalcomán and flowing southward to join with the Río San José to form the Río Cachán.
Coalcomán (Sierra de).—A highland mass outlined by the Río Coahuayana and its tributaries on the west, the Río Tepalcatepec on the north, and the Río Balsas on the east, and the Pacific Ocean on the south. The axis of the sierra extends for about 200 kilometers in a west-northwest to east-southeast direction; the mountains are nearly 80 kilometers in breadth; the highest parts of the range are about 3000 meters above sea level.
Cofradía.—Lat. 18° 56', long. 102° 17', elev. 215 m. A ranch about 17 kilometers southeast of Apatzingán; arid tropical scrub forest.
Coire.—Lat. 18° 26', long. 103° 22', elev. 300 m. A village on the seaward foothills of the Sierra de Coalcomán on the Río Coire; tropical semi-deciduous forest.
Cojumatlán.—Lat. 20° 07', long. 102° 51', elev. 1530 m. A village on the southeastern shore of Lago de Chapala; mesquite-grassland.