Wall or the fence of Tous is a massive wall made up of sun-dried brick and clay with six km long, which had surrounded Tous and had saved the city from enemy invasion.

The thickness of wall, on the earth surface is 6 m, and 2.5 m on the upper parts.

This fence, in the time of construction, contained 9 gates and 106 towers, of which 6 gates could be distinguished.

The circular fence around Tous can give the pattern of ancient Iranian cities.

Clear repair signs on some parts of the wall and existence of bits of pottery in the wall cavities, tell the story of its repetitive destruction and renovations.

This fence was repaired, for the last time, around 15th century AD in Timurid era.