Columbia Encyclopedia

(Encyclopedia) Chotts, Plateau of the shŏts [key] [Arab.,=salt lake], plateau region of the Atlas Mts., alt. c.3,500 ft (1,070 m), N Algeria, N Africa. The plateau is c.125 mi (200 km) wide in the west, narrowing i...

(Encyclopedia) Du Bois do͞oˈbois, dəboisˈ [key], city (2020 pop. 7,272), Clearfield co., W central Pa., in the ...

(Encyclopedia) Allegheny Portage Railroad National Historic Site: see National Parks and Monuments (table)national parks and monuments (table). ...

(Encyclopedia) Colorado Plateau, physiographic region of SW North America, c.150,000 sq mi (388,500 sq km), in Arizona, Utah, Colorado, and New Mexico, including the “Four Corners” area. It is characterized by b...

(Encyclopedia) Plum, borough (1990 pop. 25,609), Allegheny co., SW Pa. on the Allegheny River, in a bituminous coal area; founded 1788, inc. 1956. It is a residential suburb of Pittsburgh. Apples and nursery stock a...

(Encyclopedia) Conemaugh kŏnˈəmôˌ [key], river c.70 mi (110 km) long, rising in the Allegheny Mts. and flowing NW to the Allegheny River, SW Pa. Federal flood-control works on the river and its tributaries incl...

(Encyclopedia) Appalachian Mountains ăpəlāˈchən, –chēən, –lăchˈ– [key], mountain system of E North America, extending in a broad belt c.1,600 mi (2,570 km) SW from the Gaspé Peninsula in Quebec prov....

(Encyclopedia) Olean ōˈlēănˌ [key], city (1990 pop. 16,946), Cattaraugus co., W N.Y., on the Allegheny River near the Pa. line; settled 1804, inc. 1893. The city formerly had an oil-based economy related to nea...

(Encyclopedia) Castle Shannon, residential borough (2020 pop. 8,249), Allegheny co., SW Pa., a suburb S of Pittsburgh; inc. 1919. ...

(Encyclopedia) Backbone Mountain, peak, 3,360 ft (1,024 m) high, NW Md., in the Allegheny Mts.; highest elevation in the state.