Reflection of mountains and plains on the water surfaceReflection of mountains and plains on the water surface
Berth near the smooth surface of the lake at sunsetBerth near the smooth surface of the lake at sunset
The surface of the ancient pond was covered with brown mudThe surface of the ancient pond was covered with brown mud
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..