Dorchester on Thames (or Dorchester-on-Thames) is a village and civil parish in Oxfordshire, about 3 miles (5 km) northwest of Wallingford and 8 miles (13 km) southeast of Oxford. The town is a few hundred yards from the confluence of the River Thames and River Thame. A common practice of the scholars at Oxford was to refer to the river Thames by two separate names, with Dorchester on Thames the point of change. Downstream of the village, the river continued to be named The Thames, while upstream it was named The Isis. Ordnance Survey maps continued the practice by labelling the river as "River Thames or Isis" above Dorchester, however, this distinction is rarely made outside the city of Oxford.

Dorchester Abbey Museum is a local museum in the town of Dorchester, Oxfordshire, England. It is attached to Dorchester Abbey. The museum occupies two buildings on the site of Dorchester Abbey. The Old Schoolroom, part of the former 14th-century guest house of the abbey, has displays of artefacts, illustrations and maps concerning the history of Dorchester and its surroundings. The area has been inhabited for over 6,000 years.

Burcot is a hamlet in Oxfordshire, England on the left bank of the River Thames, in the civil parish of Clifton Hampden. Until 1932, it lay in the civil parish of Dorchester. == Facilities == Burcot lies on the main road from Dorchester to Abingdon, now the A415. Bus services are confined to schooldays.The village has a thatch-roofed pub, The Chequers, which has been developed into a restaurant, but no retail facilities. The nearest shopping centre is in Dorchester, less than two miles away.

Berinsfield is an English village and civil parish in South Oxfordshire, about 7 miles (11 km) southeast of Oxford. The 2011 Census recorded the parish population as 2,806. == History == Palaeolithic and Roman artefacts were found during 20th century excavations to build the village. The Roman road between Dorchester-on-Thames and Alchester runs through the centre of Berinsfield. An Anglo-Saxon cemetery was also found at Berinsfield.The village is on the site of RAF Mount Farm, a satellite of RAF Benson, initially used to train bomber pilots.

The Ġewisse (Old English: [jeˈwisːe]; Latin: Geuissæ) was a tribe or clan of Anglo-Saxon England, based in the upper Thames region around Dorchester on Thames. == Etymology == The name of the tribe may be derived from an Old English word for "reliable" or "sure", (cf. German gewiss, "certain, sure"). The Anglo-Saxon Chronicle presents an eponymous ancestor figure, named Giwis.Eilert Ekwall proposed that the similarity in toponymy between the kingdoms of the Gewisse and Hwicce suggests a common origin. == History == Evidence of Germanic settlements appear around Abington and Dorchester on Thames in the 420's.