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Neckar(nĕk`är), river, 228 mi (367 km) long, rising in the Black Forest, SW Germany. It flows generally N past Tübingen, Stuttgart, and Heilbronn, then W past Heidelberg before joining the Rhine River at Mannheim. The Neckar is celebrated for its scenic charm; its hilly banks are covered with fine vineyards, orchards, and woods. It is navigable for 1,000-ton barges and is connected to the Danube by a canal. There are more than 20 hydroelectric power plants on the river.
a river in the southern Federal Republic of Germany, a right tributary of the Rhine. Length, 371 km; basin area, approximately 14,000 sq km.
The Neckar rises on the slopes of the Black Forest and the Swabian-Franconian Jura, flowing primarily in a narrow, in places canyon-like, valley; it meanders sharply. Average rate of flow at the mouth is 130 cu m per sec, with maximum flow in February and March. It freezes in severe winters. The river is navigable to the city of Plochingen (203 km); there are canals and locks along much of it. The big cities of Stuttgart, Heidelberg, and Mannheim are on the Neckar.