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..