Wrangel Island () is a small island in the Arctic Ocean belonging to Russia. It lies between the Chukchi Sea and East Siberian Sea. Wrangel Island lies across the 180° meridian. The International Date Line is displaced eastwards at this latitude to avoid the island and the Chukchi Peninsula on the Russian mainland. It is roughly (about the size of the US state of Delaware). The closest land to Wrangel Island is tiny and rocky Herald Island located to the east. The distance to the closest point on the Siberian mainland is . Wrangel Island may have been the last place on earth where Woolly Mammoth survived. It is home to many arctic animals including polar bears. Since 1976 it has been a nature reserve.