the.com/wadi
a desert riverbed that's bone-dry until it tries to drown you.
flash floodsCan fill with deadly water under cloudless skies
etymologyArabic root behind Spanish place names like Guadalquivir
oasis linkUnderground moisture sustains palms and nomadic camps
camping dangerSleeping in one kills people miles from rain
mars tooAncient Martian wadis hint at vanished rivers