Death Valley to Mt. Whitney - approx 130 miles
Features the 4th highest valley to summit climb in the US at 10,000 ft.
Not a marked trail but a route.
Truly for only experienced and very fit desert hikers.
http://www.simblissity.net/L2H.shtmlThe Lowest-to-Highest (L2H) is a backcountry hiking routebetween Badwater and Mt. Whitney. Unlike the traditional "race route," the L2H avoids pavement and vehicle traffic whenever possible, in favor of a scenic, silent journey across the wilderness, as it seeks the soul of a rugged, harsh, and ultimately beautiful land. If the traditional approach is to complete an extreme journey on foot, then the L2H is about living completely in a land of extremes. Indeed, this off-highway journey encompasses even greater extremes of geography, ecology and climate, and is intended to immerse the traveler far more deeply within the environment.
Notice the picture at the bottom of the link with Swami in it just after finishing this trail? For those who have not heard of him he is one of the most accomplished hikers in history. If you want to see something amazing check his trip reports from 170 hikes around the world at his blog here: https://www.thehikinglife.com/