8.0Ruba al KhaliRub' al Khali29.12323781350000136.470703465699998 1.2Southern Gulf CostGulf Cost21.9909414117000004.706610276700000 1.1Northern Gulf CostGulf Cost8.4795695165200001.174131050800000 2.1Summam PlateauEastern Najd15.89610218350000014.326173188600000 2.2South Eastern NajdEastern Najd21.42833753320000116.373541696600000 3.1North Central NajdWestern and Central Najd19.83310797800000114.768264611399999 3.2South Western NajdWestern and Central Najd32.16388479340000133.583429984600002 4.1Northern frontier ZoneNorthern Plains16.19149993540000011.215714005800001 4.2The Great NafudNorthern Plains17.72842739080000014.024867565399999 6.5Bishah PlateauAsir Mountains8.4953495618199994.226744644900000 6.4Eastern AsirAsir Mountains10.2941052084000002.635787969710000 6.3Middle Eastern AsirAsir Mountains13.9170126605999992.031124467480000 6.2High AsirAsir Mountains9.4219586455299991.006695060720000 6.1Asir ScarpAsir Mountains12.9972492854000012.332098667970000 5.1MiddyanHijaz Highlands6.1255945547000001.274509172470000 5.2Northern HijazHijaz Highlands11.1255953449000012.262113969040000 5.4Madinah BasinHijaz Highlands3.8701451952400000.622249785630000 5.3Southern HijazHijaz Highlands12.4175955610000014.930989264910000 5.5Makkah BasinHijaz Highlands2.9589381529900000.359188254740000 7.2Southern TihamahRed Sea Cost16.3232283691000011.526796263630000 7.1Northern TihamahRed Sea Cost15.9715788300000001.405303097770000