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Allegheny
(Encyclopedia)Allegheny ălˈəgāˌnē, ălˈəgäˌnē [key], river, 325 mi (523 km) long, rising in N central Pa., and flowing NW into N.Y., then SW through Pa. to the Monongahela, with which it forms the Ohio R...Allegheny Plateau
(Encyclopedia)Allegheny Plateau, dissected plateau, western part of the Appalachian Mts., extending c.500 mi (800 km) SW from N Pa. to SW Va., rising to c.4,860 ft (1,480 m) at Spruce Knob, the highest peak in West...Allegheny Portage Railroad National Historic Site
(Encyclopedia)Allegheny Portage Railroad National Historic Site: see National Parks and Monuments (table)national parks and monuments (table). ...Plum, city, Pennsylvania
(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...Conemaugh
(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...Olean
(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...Altoona
(Encyclopedia)Altoona ălto͞oˈnə [key], industrial city (2020 pop. 43,963), Blair co., central Pa., on the eastern slopes of the Allegheny Mts., near the source of the Juniata River;...Castle Shannon
(Encyclopedia)Castle Shannon, residential borough (2020 pop. 8,249), Allegheny co., SW Pa., a suburb S of Pittsburgh; inc. 1919. ...Backbone Mountain
(Encyclopedia)Backbone Mountain, peak, 3,360 ft (1,024 m) high, NW Md., in the Allegheny Mts.; highest elevation in the state.Monroeville
(Encyclopedia)Monroeville, borough (1990 pop. 29,169), Allegheny co., SW Pa., a suburb of Pittsburgh; settled 1810, inc. 1952. It is primarily residential, with a major shopping mall. Monroeville has chemical and n...Browse by Subject
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