Smoo Cave, a large combined sea cave and freshwater cave in Durness in Sutherland, Highland, Scotland. The cave name is thought to originate from the Norse 'smjugg' or 'smuga', meaning a hole or hiding-place.

HighlandsScotlandGreat BritainUnited KingdomScottishNorth Coast 500EuropeDurnessSmoo CaveSutherlandsea cavefreshwater cavenorsesmjuggsmugaholehidingplaceordoviciandolomiteslimestonesagomore formationsailmhor formationleopard rockgeologyAllt Smoowaterfallchambercovered walkwaysink holepermeabletoursiteseeingraftexplorecavingtidal gorgeboatneolithiciron agemesolithicisostatic uplifthikingclimbingguided tourvacationchertnodulesstreamwater