Joshua Tree National Park is a national park located in southeastern California, near the Nevada border. It is named after the Joshua tree, a type of yucca plant that is native to the area. The park covers an area of 790, 636 acres and is home to a variety of plants and animals, including the endangered desert tortoise. The park is also known for its stunning rock formations, which are popular among hikers and climbers. The crossword solution for the term 'Joshua Tree National Park' is 'TREE', referring to the Joshua tree, which is the namesake of the park.