Highfield is a city in England, and the surface location where the Tunnels series takes place.

The city is located on the northern outskirts of London, founded back in Roman times. Its rapid development began during the industrial revolution. Highfield is located directly above the Colony, connected with it by a network of tunnels.

It was the residence place for the main characters of the series, such as Will Burrows, his father and Chester Rawls.