Sunset over the silent lake, at the surface of the ghostly waterSunset over the silent lake, at the surface of the ghostly water
A beautiful shell on the smooth surface of the seaA beautiful shell on the smooth surface of the sea
An astronaut on the surface of the moon with a us flagAn astronaut on the surface of the moon with a US flag
Boats on the sea surface in the light of the setting sunBoats on the sea surface in the light of the setting sun
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..