Upper Thames Clay Vales

The Upper Thames Clay Vales is a National Character Area (NCA) as designated by Natural England. It completely surrounds the NCA known as the Midvale Ridge. It is a belt of low-lying farmland on predominantly Jurassic and Cretaceous clays. Its landscapes include enclosed pastures, wet valleys, mixed farmland, hedges, and open arable lands with mature field oaks in places. Its principal settlements are Kidlington, Bicester, Aylesbury, Thame, Wallingford, Didcot, Abingdon, Wantage, Royal Wootton Bassett, Cricklade and Witney, along with parts of Swindon and Oxford. Small parts of the boundary areas of the Cotswolds, Chilterns and North Wessex Downs lie within it. It includes the flatlands of Otmoor and is watered by the rivers Thames, Ock, Thame and Ray. It is mostly within Oxfordshire but includes parts of Buckinghamshire, Wiltshire and Gloucestershire.

Principal summits

Although a low-lying region, the NCA does have a few hills. Hills within the NCA with more than 30 metres of prominence are listed below:

Hill	Elevation	Prominence	Grid reference
Hook Hill	155 m (509 ft)	53 m	SU075849
Adwell Cop	148.6 m (488 ft)	33.4 m	SU703990
Worthy Hill	134 m (440 ft)	30 m	SU019881
Wittenham Clumps	123.4 m (405 ft)	69 m	SU566927
Burn Hill	117 m (384 ft)	32 m	SP778124
Graven Hill	115 m (377 ft)	48 m	SP588204
Arncott Hill	108 m (354 ft)	34 m	SP616171
Woodeaton Hill	102 m (335 ft)	38 m	SP534125