The Mojave National Preserve covers some of the eastern desert, especially between Interstate 15 and Interstate 40. The desert portion also includes the cities of Needles next to the Colorado River and Barstow at the junction of Interstate 15 and Interstate 40. Trona is at the northwestern part of the county, west of Death Valley. This national park, mostly within Inyo County, also has a small portion of land within San Bernardino County. The largest metropolitan area in the Mojave Desert part of the county is the Victor Valley, with the incorporated localities of Adelanto, Apple Valley, Hesperia, and Victorville. Further south, a portion of Joshua Tree National Park overlaps the county near the High Desert area, in the vicinity of Twentynine Palms. The remaining towns make up the remainder of the High Desert: Pioneertown, Yucca Valley, Joshua Tree, Landers, and Morongo Valley.