adventure
arid
background
baja california
climate
colorful
desert
drought
dry
dune
dunes
ecology
ecosystem
environment
erosion
extreme
footprint
global
gobi
heat
hot
mexico
mongolia
morocco
namib
namibia
national park
nature
nobody
open space
orange
outdoor
peaceful
recreation
rough
sand
survival
thirst
tourism
travel
united states
unspoiled
unusual
warming
waterless
wilderness