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The Lena River, some 4,500 km (2,800 mi) long, is one of the longest rivers in the world. The Lena Delta Reserve, shown in this enhanced satellite photo, is the most extensive protected wilderness area in Russia; it serves as an important refuge and breeding ground for many species of Siberian wildlife. The wave-dominated delta of the Lena River is 30,000 sq km (11,580 sq mi) making it one of the largest of its kind in the world. Image courtesy of USGS.