Eureka Valley Sand Dunes over into Death Valley. There was one narrow canyon we were following, and it was just a bit off the maps, so we weren't sure it had an exit, but we left ourselves plenty of time to backtrack. We'd see a high wall ahead of us, figuring that was the end, and then we'd get closer and realize that the canyon turned, and at the top, after going through a narrow spot maybe five feet wide it opened onto a hill covered with Joshua trees and a broad view of Death Valley.