Jizera

Jizera 

the northwestern part of the Sudetes Mountains in Poland and Czechoslovakia. Length, about 40 km; maximumaltitude, 1, 127 m. In appearance, it is a mass of folded stone blocks, with steep, fault-like slopes and a flat top. The range is composed primarily of granite and crystalline schist. Coniferous forests cover the mountainsides.

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Jizera 

a river in Czechoslovakia; its headwaters are on the border between Poland and Czechoslovakia. Rising in the Jizera Mountains, the river flows primarily over the hilly plains of North Bohemia until it joins the Labe (Elbe) River, entering it from the right. Length, 163 km. Basin area, 2, 200 sq km. The average rate of flow in its lower reaches is about 25 cu m per sec. Its waters are used for timber rafting, as well as to drive a hydroelectric power plant. The cities of Turnov and Mladá Boleslav are located on the river.