Migrant’s Water Jug on Fence Post — San Pedro Riparian National Conservation Area 2007

Water bot­tles point to the phys­i­cal risks of jour­ney­ing north with­out au­tho­riza­tion. The hu­man body re­quires at least two gal­lons of wa­ter per day to sus­tain phys­i­cal ac­tiv­ity in the desert dur­ing sum­mer months. Most hu­mans are in­ca­pable of car­ry­ing enough wa­ter and many suc­cumb to hy­per­ther­mia, even within short dis­tances of the po­lit­i­cal boundary.