Lighthouse surrounded by a smooth surface of waterLighthouse surrounded by a smooth surface of water
Stone surface against the background of the night skyStone surface against the background of the night sky
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..