The surface of the lake against the background of forests and mountainsThe surface of the lake against the background of forests and mountains
Stone surface against the background of the night skyStone surface against the background of the night sky
Lighthouse surrounded by a smooth surface of waterLighthouse surrounded by a smooth surface of water
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
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..