Hawaiʻi Volcanoes National Park was established on August 1, 1916, as Hawaiʻi National Park. Congress gave the island of Hawaiʻi portion its present name on September 22, 1961.
The fact sheet, updated May 15, 2025, calls it the 15th national park and states the purpose: protect, study, and provide access to Kīlauea and Mauna Loa, two of the world's most active volcanoes, and perpetuate endemic Hawaiian ecosystems and the traditional culture connected to them. An older World Heritage page gave a smaller acreage and a slightly lower summit. This essay uses the fact sheet.
That sheet says the park extends from sea level to 13,681 feet and covers 354,461 acres, with 123,100 acres of legislated wilderness. It is an International Biosphere Reserve (1980) and a World Heritage Site (1987).