The highest mountains, are located inland, where Oksskolten is the highest mountain in Northern Norway. There are many valleys inland, such as the Dunderland Valley, Vefsndalen, and Hattfjelldal. Røssvatnet is the second largest lake in Norway. There are three large national parks in Helgeland: Saltfjellet-Svartisen National Park (partly), Børgefjell National Park (partly), and Lomsdal-Visten National Park (created in May 2009).