Reflection of the castle in the surface of the waterReflection of the castle in the surface of the water
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
A floating flock of dolphins above the surface of the waterA floating flock of dolphins above the surface of the water
Lighthouse surrounded by a smooth surface of waterLighthouse surrounded by a smooth surface of water
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..