Quiet surface of the lake, landscape against the background of mountainsQuiet surface of the lake, landscape against the background of mountains
The heavenly surface of the lake on the background of the mountainThe heavenly surface of the lake on the background of the mountain
A grey ferrari car standing on a reflective surfaceA grey Ferrari car standing on a reflective surface
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..