The setting sun, going beyond the edge of the forest, is reflected in the water surfaceThe setting sun, going beyond the edge of the forest, is reflected in the water surface
Painted surface with autumn leaves in drops of waterPainted surface with autumn leaves in drops of water
A picture of two delicate fresh flowers on a wet surfaceA picture of two delicate fresh flowers on a wet surface
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..