Wrangel Island
According to a 2003 report prepared by the Wrangel Island Nature Preserve, the hydrographic network of Wrangel Island consists of approximately 1,400 rivers over in length; five rivers over long; and approximately 900 shallow lakes, mostly located in the northern portion of Wrangel Island, with a total surface area of . The waters of the East Siberian Sea and the Sea of Chukchi surrounding Wrangel and Herald Islands are classified as a separate chemical oceanographic region. These waters have among the lowest levels of salinity in the Arctic basin as well as a very high oxygen content and increased biogenic elements.