<P> Land boundaries: total: 4,415 km border countries: Iraq 814 km, Jordan 728 km, Kuwait 222 km, Oman 676 km, Qatar 60 km, UAE 457 km, Yemen 1,458 km </P> <P> Coastline: 2,640 km </P> <P> Maritime claims: contiguous zone: 18 nmi (33.3 km; 20.7 mi) continental shelf: not specified territorial sea: 12 nmi (22.2 km; 13.8 mi) </P> <P> Until the 1980s, Saudi Arabia had lakes at Layla Aflaj and deep waterholes at' Al - Kharj, fed by huge underground aquifers formed in prehistoric times and non-renewable .' Al Kharj was a valuable source of drinking water in a barren terrain . In recent years, these aquifer have been drawn upon heavily, both for agricultural and domestic purposes, and no fresh water remain in the lakes or pits . </P>

Name the desert regions in arabia and china that are uninhabited