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Little Wittenham is a village and civil parish on the south bank of the River Thames, northeast of Didcot in South Oxfordshire. In 1974 it was transferred from Berkshire to the county of Oxfordshire and from Wallingford Rural District to the district of South Oxfordshire.

Wittenham Clumps are a pair of wooded chalk hills in the Thames Valley, in the civil parish of Little Wittenham, in the historic county of Berkshire, although since 1974 administered as part of South Oxfordshire district. The higher of the two, Round Hill, is 390 feet (120 m) above sea-level. The 350 feet (110 m) Castle Hill is about 380 yards (350 m) south-east and was the site of an Iron Age hill fort. A third hill, not normally considered one of The Clumps, is Brightwell Barrow, further to the south-east. The grassed slopes of The Clumps lead up to summits wooded by the oldest beech tree plantings in England, dating to the 1740s. Standing over 70 metres above their surroundings, the Clumps have a prominent appearance and panoramic views, with the north slopes overlooking villages and towns whose sites mark some of the first settlements of the English. The view from The Clumps was described by the artist Paul Nash, who first saw them in 1911, as "a beautiful legendary country haunted by old gods long forgotten".The Clumps are the most visited outdoor site in the administrative county of Oxfordshire, attracting over 200,000 visitors a year. A car park was added in 1971, and the extensive network of paths are accessible by foot all year round. A path through the wooded area at the top of Round Hill has enabled access since 2005, after being closed for twenty years. The site and its surroundings are maintained as a Nature Reserve by the Earth Trust.

The Poem Tree was a beech tree with a poem carved into it by Joseph Tubb, located on Castle Hill at Wittenham Clumps in Oxfordshire, England. The tree was believed to be around 300 years old, with Tubb's poem being carved in the 1840s. The tree died in the 1990s and rotted completely while standing, before collapsing during a period of inclement weather in July 2012.A stone, including a transcription and rubbing of the poem, was erected close to the tree in 1994, to commemorate the 150th anniversary of the carving.

Little Wittenham Bridge is a footbridge across the River Thames in England near Dorchester-on-Thames, Oxfordshire. It is just downstream of Day's Lock on the reach above Benson Lock and connects Little Wittenham to Dorchester. The bridge spans the river in two sections with Lock House Island in between. The lock house, built in 1928 is situated on the island. The bridge is one of two used in the World Poohsticks Championships for the heats, and is used as the bridge for the final of the event.

Day's Lock is a lock on the River Thames near Dorchester-on-Thames, Oxfordshire, England on the Dorchester side of the river. The pound lock was built in 1789 by the Thames Navigation Commissioner. The lock is across the river from the small village of Little Wittenham and is overlooked from the south by the hills of Wittenham Clumps, with a particularly good view from Round Hill. The weir runs straight across the river from the other side of the lock island. Day's Lock is the main gauging station for the measurement of the water flow in the River Thames. The Thames Path crosses the river here. The World Poohsticks Championships, on behalf of the RNLI, have taken place annually here since 1983.

Little Wittenham SSSI is a 68.9-hectare (170-acre) biological Site of Special Scientific Interest north-east of Didcot in Oxfordshire. It is also a Special Area of Conservation.This site, which is managed by the Earth Trust, consists of woods, grassland, scrub and ponds on the slope of a hill next to the River Thames. Flora include the nationally scarce greater dodder, and there is a rich assemblage of amphibians, including one of the largest populations in the country of the great crested newt, which is a priority species of the Biodiversity action plan.

Paradise Wood is a research woodland established by the Earth Trust (formerly Northmoor Trust) between the villages of Little Wittenham and Long Wittenham in Oxfordshire England. It has evolved to become the largest collection of hardwood forestry trials in Britain.Planning for the wood started in 1992 and tree planting began in 1993. The Research Woodland was originally conceived and developed by Gabriel Hemery and was established as a centre for research into the improvement of the quality and productivity hardwood trees. The ultimate aim is to create a woodland of 55 hectares in area. It contains a large number of trials supervised by the Future Trees Trust.On the northern edge of Paradise Wood a small community woodland was planted in 2005 to commemorate the 200th anniversary of the Battle of Trafalgar. It was named after HMS Neptune as part of a project with the Woodland Trust. It provides free public access and contains some oak trials.

Brightwell Barrow is a Bronze Age round barrow in the civil parish of Brightwell-cum-Sotwell in the English county of Oxfordshire (formerly Berkshire). It lies just under a kilometre from Wittenham Clumps. Its position is marked by a small clump of trees on its peak. Brightwell Barrow is mentioned in the Domesday Book under the entry for Brightwell-cum-Sotwell.

The Sylva Foundation is an environmental organisation focusing on trees and forestry established in 2006, and registered as a charity in England and Wales in 2009 and with the Office of the Scottish Charity Regulator in 2010. The organisation was co-founded by Sir Martin Wood and Dr Gabriel Hemery. Its office is at the Sylva Wood Centre in Long Wittenham in Oxfordshire, England. Sylva Foundation is a national charity supporting sustainable forest management. Sylva Foundation's main programmes are Forestry, Education, Science, and Wood.In 2013, 20 hectares (12 acres) of land near Long Wittenham was gifted to the charity. In 2016 the charity moved its main office to the site and established the Sylva Wood Centre, which provides a hub for small businesses and craftspeople who design, innovate or make in wood. In 2017 the Sylva Foundation created the Wittenhams Community Orchard and Future Forest on its land.

Long Wittenham is a village and small civil parish about 3 miles (5 km) north of Didcot, and 3.5 miles (5.6 km) southeast of Abingdon. It was part of Berkshire until the 1974 boundary changes transferred it from Berkshire to Oxfordshire, and from the former Wallingford Rural District to the new district of South Oxfordshire.

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.

Brightwell Castle was in the village of Brightwell-cum-Sotwell, between the towns of Didcot and Wallingford (grid reference SU578908), now in Oxfordshire but until 1974 in Berkshire, in England. The castle was built in 1145 by King Stephen. At the time there was civil war known as The Anarchy between King Stephen and his cousin Empress Matilda, whose headquarters were at nearby Wallingford Castle. In 1153 the castle was destroyed by Matilda's son, who later became Henry II. A manor house now stands on the site.