Pine trees and the sky reflected in the water surfacePine trees and the sky reflected in the water surface
White running clouds over the mountains and the water surfaceWhite running clouds over the mountains and the water surface
The sun appeared over the mountain, in front of which the water surface stretchedThe sun appeared over the mountain, in front of which the water surface stretched
The surface of the lake against the background of a very beautiful sunsetThe surface of the lake against the background of a very beautiful sunset
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..