The Metropolitan Cathedral Church of St George, usually known as St George's Cathedral, Southwark is the cathedral of the Roman Catholic Archdiocese of Southwark, south London and is the seat of the Archbishop of Southwark. The Cathedral is the Mother Church of the Roman Catholic Province of Southwark which covers the Archdiocese of Southwark (all of London south of the River Thames including Kent and north Surrey) and the Dioceses of Arundel and Brighton, Portsmouth, and Plymouth. It is the Metropolitan Cathedral of the Archbishop of Southwark.