http://www.english.hadhramaut.info Wadi Hadhramaut [The Source: - ] Wadi Hadhramaut This is the largest wadi in the Arabian peninsula. Situated  about 160 km from the coast, it follows an east-west route for about 160 km through the desert. The wadi bottom drops to a  depth of about 300 metres. The region is very fertile and the local population lives on arable farming and goat-herding. There are several archaeological sites in the region, which  show signs of early settlement before the 3rd century A.D. Situated in this cultural landscape are the three cities Shibam, Sa’yun and Tarim