Sebastopol is the southernmost suburb of Pontypool in the county borough of Torfaen, within the historic boundaries of Monmouthshire in South Wales. It is named in honour of the Crimean city Sevastopol that was taken during the Crimean War. It is a working-class area consisting of mainly privately owned terraced houses and a substantial number of …Sebastopol is the southernmost suburb of Pontypool in the county borough of Torfaen, within the historic boundaries of Monmouthshire in South Wales. It is named in honour of the Crimean city Sevastopol that was taken during the Crimean War. It is a working-class area consisting of mainly privately owned terraced houses and a substantial number of local authority/ex-local authority housing.