Lotus water lilies on the swamp surface of the waterLotus water lilies on the swamp surface of the water
The reflection of the mountains in the mirror surface of the lakeThe reflection of the mountains in the mirror surface of the lake
The journey of a lonely ship on the expanses of the water surfaceThe journey of a lonely ship on the expanses of the water surface
The surface of the lake against the background of snow-capped mountainsThe surface of the lake against the background of snow-capped mountains
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..