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
Reflection of the sunset on the surface of the waterReflection of the sunset on the surface of the water
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..