A few purple leaves. fallen on the surface of blue waterA few purple leaves. fallen on the surface of blue water
Reflection of snowy mountains in the water surfaceReflection of snowy mountains in the water surface
A soccer ball lying on the green surface of a huge stadiumA soccer ball lying on the green surface of a huge stadium
В математике: граница, отделяющая геометрическое тело от внешнего пространства. Наружная сторона чего-н..