open air, out-of-doors, outdoors, open - where the air is unconfined; "he wanted to get outdoors a little"; "the concert was held in the open air"; "camping in the open"

region, part - the extended spatial location of something; "the farming regions of France"; "religions in all parts of the world"; "regions of outer space"

surface - the extended two-dimensional outer boundary of a three-dimensional object; "they skimmed over the surface of the water"; "a brush small enough to clean every dental surface"; "the sun has no distinct surface"

out-of-door, outdoor, outside - located, suited for, or taking place in the open air; "outdoor clothes"; "badminton and other outdoor games"; "a beautiful outdoor setting for the wedding"