The Korean Peninsula is located in North-East Asia. It is bordered by the Amnok River (Yalu River) to the northwest, separating Korea from China, and the Duman River (Tumen River) to the northeast which separates Korea from both China and Russia. The country itself is flanked by the Yellow Sea to its west and the East Sea to the east. There are several notable islands that surround the peninsula including Jejudo, Ulleungdo and Dokdo. The Korean peninsula is roughly 1,030 km (612 miles) long and 175 km (105 miles) wide at its narrowest point. Korea's total land area is 100,033 sq km, and it has a population of 49.8 million people (2011). Because of its unique geographical location, Korea is a very valuable piece of land and an international hub of Asia. Mountains cover 70% of Korea's land mass, making it one of the most mountainous regions in the world. The lifting and folding of Korea’s granite and limestone base create a breathtaking landscape of scenic hills and valleys. The mountain range that stretches along the length of the east coast falls steeply into the East Sea, while along the southern and western coasts, the mountains descend gradually to the coastal plains that produce the bulk of Korea’s agricultural crops, especially rice.