Cobblestone is a natural building material based on cobble-sized stones, and is used for pavement roads, streets, and buildings.

In England, it was commonplace since ancient times for flat stones with a flat narrow edge to be set on an even paved surface.

This was known as a 'pitched' surface and was common all over Britain, as it did not require rounded pebbles.

Pitched surfaces predate the use of regularly-sized granite sets by more than a thousand years.

Such pitched paving is quite distinct from the rounded stones, although both forms are referred to as 'cobbled' surfaces.

Most surviving genuinely old 'cobbled' areas are in reality pitched surfaces.

A cobbled area is known as "causey", "cassay" or "cassie" in Scots (probably from causeway). 

Although cobblestone is often referred to as "cobblestone," cobblestone is often found in a naturally occurring form.