Columbia Encyclopedia

(Encyclopedia) Piedras Negras, city (1990 pop. 96,178), Coahuila state, N Mexico, on the Rio Grande opposite Eagle Pass, Tex. Founded in 1849, the city grew as an international shipping point. Piedras Negras is a co...

(Encyclopedia) Grijalva grēhälˈvä [key], river, c.400 mi (640 km) long, rising in SW Guatemala and flowing NW into S Mexico and N through Chiapas and Tabasco states to the Gulf of Campeche. It is navigable for c...

(Encyclopedia) Negro, Río rēˈō nāˈgrō [key], river, c.1,400 mi (2,250 km) long, rising as the Guainía River in E Colombia where it flows NE before turning south to form part of the Colombia-Venezuela border....

(Encyclopedia) Negro, Río rēˈō nāˈgrō [key], principal river of Uruguay, c.500 mi (800 km) long, rising in S Brazil and flowing SW across central Uruguay to the Uruguay River. It traverses a sheep-raising reg...

(Encyclopedia) Gadsden Purchase gădzˈdən [key], strip of land purchased (1853) by the United States from Mexico. The Treaty of Guadalupe Hidalgo (1848) had described the U.S.-Mexico boundary vaguely, and Presiden...

(Encyclopedia) Conchos kōnˈchōs [key], river, c.350 mi (560 km) long, rising in S Chihuahua state, N Mexico, and flowing N and NE to the Rio Grande. Dams along its middle course provide water for extensive cotton...

(Encyclopedia) Lerma lārˈmä [key], river, c.350 mi (560 km) long, rising in Mexico state, central Mexico. It flows NW and W through Guanajuato state to Lake Chapala, crossing the part of the central plateau known...

(Encyclopedia) Uruguay yo͝oˈrəgwā, gwī, Span. o͞oro͞ogwiˈ, o͞oro͞owīˈ [key], river, c.1,000 mi (1,610 km) long, rising in S Brazil and flowing in an arc W, SW, and S to the Río de la Plata, an estuary; ...

(Encyclopedia) Detroit, river, 32 mi (52 km) long, flowing from Lake St. Clair S into Lake Erie between Detroit, Mich., and Windsor, Ont.; it forms part of the U.S.-Canada boundary. It is one of the most heavily ind...

(Encyclopedia) Mississippi, river, principal river of the United States, c.2,350 mi (3,780 km) long, exceeded in length only by the Missouri, the chief of its numerous tributaries. The combined Missouri-Mississippi ...