Also known as the Two Tunnels Bath Marathon, this unique competition is UK’s longest underground running race, so expect an experience like no other! The route goes through newly restored railway tunnels which pass deep under the World Heritage City of Bath. The rest of the route takes in the best sites of the city and countryside.With over 4km of underground running, you are in for a truly unique running experience as you take in the converted railway tunnels that pass beneath the city. Other sites to take in are beautiful city parks, the world famous architecture of Bath Abbey and Pulteney Bridge as well as the stunning rolling countryside of the Avon Valley.The event forms the headline event in the Two Tunnels Railway Races which features supporting half marathon, 10km, 5km and Colourburst events making this a great sporting day out which the whole family can enjoy.The City of Bath Marathon is brought to you by Relish The Great Outdoors Ltd who have been delivering exciting running events across the South West of the UK since 2011.