Over half of the park () was designated the Hawaii Volcanoes Wilderness area in 1978, providing solitude for hiking and camping. Wilderness designation covers the northwestern extension of the National Park, including Mokuaweoweo, the summit of the volcano Mauna Loa. In the southwestern portion of the park, a large chunk of wilderness includes several miles of coastline and a small portion southeast of the visitors center. The park encompasses diverse environments from sea level to the summit of the Earth's most massive active volcano, Mauna Loa, at . Climates range from lush tropical rain forests, to the arid and barren Kaʻū Desert.