Berth near the smooth surface of the lake at sunsetBerth near the smooth surface of the lake at sunset
A lonely boat on the blue surface of the sea under white cloudsA lonely boat on the blue surface of the sea under white clouds
Lighthouse surrounded by a smooth surface of waterLighthouse surrounded by a smooth surface of water
Trees in autumn attire, reflected in the surface of the lake in clear and windless weatherTrees in autumn attire, reflected in the surface of the lake in clear and windless weather
The reflection of the mountains in the mirror surface of the lakeThe reflection of the mountains in the mirror surface of the lake
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..