Noboribetsu (登別市, Noboribetsu-shi, Ainu: nupur-pet) is a city in Iburi Subprefecture, Hokkaido, Japan. Part of Shikotsu-Toya National Park, it is southwest of Sapporo, west of Tomakomai and northeast of Hakodate. The name, Noboribetsu, derives from an Ainu word, nupur-pet, which means dark-coloured river; the kanji 登別, meaning "climbing different", are used for their phonetic value only, and have no relation to the original meaning. Six kilometres inland from Noboribetsu City in the river valley is the smaller town of Noboribetsu-onsen (登別温泉). The town has a range of onsen for bathing as well as other hot springs formed from different minerals for scenic viewing and is also known for its bear park. Noboribetsu-onsen is one of many well-known resorts in Japan, with many hotels and ryokan, and is the largest "hot spring town" in Hokkaido.