In November 2013 I visited Joshua Tree National Park in Southern California.  The park is on the boundary of two of the four deserts in the US - the higher elevation Mojave desert and the lower elevation Sonoran desert.  We spent most of our time in the higher elevation Mojave desert where there is more annual rainfall and more interesting plant life and terrain.  This part of the park is where you find the Joshua Tree and the Wonderland of Rocks.  Hiking at nearly 5000 feet for ten hours a day from sun-up to sun-down certainly took a toll!

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