Mojave is about 2/3 the size of Death Valley, and 3 times the size of Grand Canyon NP. ... About 100 mi across by 50 mi wide at the widest point. Like Joshua Tree and Death Valley, there are hundreds if not thousands of points of interest that 99.9% of us would miss without a lot of research. Without a doubt you could spend a lifetime wheeling either of these 3 desert treasures. The map stays within the triangle formed by the 15 to the north, the 40 to the south, and the 95 to the east.