Dorchester, Oxfordshire

Dorchester-on-Thames is a village and civil parish on the River Thames in Oxfordshire, about northwest of Wallingford and southeast of Oxford. Despite its name, Dorchester is not directly on the River Thames, but a few hundred yards from the Thame's confluence with it. Historically the Thames was only so named downstream of the village; upstream it is named the Isis, and Ordnance Survey maps continue to label the river as "River Thames or Isis" above Dorchester. In practice, however, this distinction is rarely made outside the city of Oxford.