Chukotka is home to Elgygytgyn Lake, an impact crater lake and the Anyuyskiy, an extinct volcano. The village of Uelen is the easternmost settlement in Russia and the closest substantial settlement to the United States (Alaska). The autonomous okrug's surface area is , about 6% larger than the U.S. state of Texas, and is the 7th-largest Russian federal subject. The region is the most northeasterly region of Russia, and since the Alaska Purchase has been the only part of Russia lying partially in the Western Hemisphere (east of the 180th meridian). Chukotka shares a border with the Sakha Republic to the west, Magadan Oblast to the south-west, and Kamchatka Krai to the south.