A beautiful shell on the smooth surface of the seaA beautiful shell on the smooth surface of the sea
Futuristic map of the earth's surface in green lightFuturistic map of the earth's surface in green light
A large bouquet of yellow tulips lies on the surface on a white backgroundA large bouquet of yellow tulips lies on the surface on a white background
Sunset over the silent lake, at the surface of the ghostly waterSunset over the silent lake, at the surface of the ghostly water
Quiet surface of the lake, landscape against the background of mountainsQuiet surface of the lake, landscape against the background of mountains
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..