Cumulus sunset clouds over the surface of the lakeCumulus sunset clouds over the surface of the lake
Perfect reflection in the mirror surface of the waterPERFECT REFLECTION IN THE MIRROR SURFACE OF THE WATER
Reflection of the castle in the surface of the waterReflection of the castle in the surface of the water
The mirror surface of the lake reflects the sky, mountain peaks and treesThe mirror surface of the lake reflects the sky, mountain peaks and trees
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..