Haleakalā Crater is a massive volcanic caldera located on the island of Maui in Hawaii. It is part of the Haleakalā National Park and spans about 7 miles across and 2.5 miles wide. The crater was formed by a series of volcanic eruptions, with the last major eruption occurring around 1790. The area is known for its stunning landscapes, including unique rock formations and diverse ecosystems. Visitors often come to witness the breathtaking sunrises and sunsets from the summit, which stands at 10,023 feet above sea level. The park is also home to several endangered species, making it an important site for conservation.