A yellow tennis ball lying on the surface of the courtA yellow tennis ball lying on the surface of the court
Reflections of the ferris wheel in the surface of the megapolis riverReflections of the Ferris wheel in the surface of the megapolis river
Night lights of the metropolis on the background of the water surfaceNight lights of the metropolis on the background of the water surface
Two anime heroines in white dresses floating in the air above the surface of the seaTwo anime heroines in white dresses floating in the air above the surface of the sea
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..