Reflection of mountains and plains on the water surfaceReflection of mountains and plains on the water surface
Dawn with reflection of light on the water surfaceDawn with reflection of light on the water surface
The night city reflected in the surface of the waterThe night city reflected in the surface of the water
White running clouds over the mountains and the water surfaceWhite running clouds over the mountains and the water surface
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..