Longest rivers of the United Kingdom in the context of "Thames"

The River Thames (/tɛmz/ TEMZ), known alternatively in parts as the River Isis, is a river that flows through southern England including London. At 215 miles (346 km), it is the longest river entirely in England and the second-longest in the United Kingdom, after the River Severn.

The river rises at Thames Head in Gloucestershire and flows into the North Sea near Tilbury, Essex and Gravesend, Kent, via the Thames Estuary. From the west, it flows through Oxford (where it is sometimes called the Isis), Reading, Henley-on-Thames and Windsor. The Thames also drains the whole of Greater London.

The River Ouse (/uːz/ OOZ) is a river in North Yorkshire, England. Hydrologically, the river is a continuation of the River Ure, and the combined length of the River Ure and River Ouse makes it, at 129 miles (208 km), the sixth-longest river of the United Kingdom and (including the Ure) the longest to flow entirely in one county. The length of the Ouse alone is about 52 miles (84 km) but the total length of the river is disputed.

It is a matter of opinion as to whether the River Ouse is formed at the confluence of the River Ure and the much-smaller Ouse Gill Beck at Cuddy Shaw Reach near Linton-on-Ouse, about six miles downstream of the confluence of the River Swale with the River Ure. An alternative opinion is recorded in a publication published in The Yorkshire Post in a series dated 1891, written and illustrated by Tom Bradley. His description and bird's-eye-view maps—specifically in his account of the River Swale—suggests that the River Ouse starts at the confluence of the Swale and the Ure. His narrative states that the Ouse has no specific source, simply flowing from the stated confluence until it runs into the Humber at the confluence of the Ouse and Trent.

The River Tay (Scottish Gaelic: Tatha, IPA: [ˈt̪ʰa.ə]; probably from the conjectured Brythonic Tausa, possibly meaning 'silent one' or 'strong one' or, simply, 'flowing') is the longest river in Scotland and the seventh-longest in Great Britain. The Tay originates in western Scotland on the slopes of Ben Lui (Scottish Gaelic: Beinn Laoigh), then flows easterly across the Highlands, through Loch Dochart, Loch Iubhair and Loch Tay, then continues east through Strathtay (see Strath), in the centre of Scotland, then southeasterly through Perth, where it becomes tidal, to its mouth at the Firth of Tay, south of Dundee. It is the largest river in the United Kingdom by measured discharge. Its catchment is approximately 2,000 square miles (5,200 square kilometres), the Tweed's is 1,500 sq mi (3,900 km) and the Spey's is 1,097 sq mi (2,840 km).

The river has given its name to Perth's Tay Street, which runs along its western banks for 830 yards (760 metres).

The Trent, the third-longest river in the United Kingdom, has its source in Staffordshire, on the southern edge of Biddulph Moor. It flows through and drains the North Midlands into the Humber Estuary. The river is known for dramatic flooding after storms and spring snowmelt, which in the past have often caused the river to change course.

The river passes through Stoke-on-Trent, Stone, Staffordshire, Rugeley, Burton-upon-Trent and Nottingham before joining the Yorkshire Ouse at Trent Falls to form the Humber Estuary, which empties into the North Sea between Kingston upon Hull in Yorkshire and Immingham in Lincolnshire. The wide Humber estuary has often been characterised as the boundary between the Midlands and Northern England ("The North").

The River Nene (/ˈnɛn/ or /ˈniːn/) flows through the counties of Northamptonshire, Cambridgeshire, Norfolk and Lincolnshire in eastern England, into The Wash in the North Sea. It flows largely northeast from its sources in Arbury Hill in Northamptonshire to its mouth at Lutton Marsh. The Nene and its tributaries drain an area of about 2,270 square kilometres (880 sq mi), with a population of 750,000.

The Nene's main tributaries include the River Ise, Wootton Brook, Willow Brook, and Harper's Brook. At 105 miles (169 km) long, it is the tenth-longest river in the United Kingdom, and is tidal for 45 kilometres (28 mi) up to Dog-in-a-Doublet sluice, near Peterborough.

The River Great Ouse (/uːz/ ooz) is a river in England, the longest of several British rivers called "Ouse". From Syresham in Northamptonshire, the Great Ouse flows through Buckinghamshire, Bedfordshire, Cambridgeshire and Norfolk to drain into the Wash and the North Sea near Kings Lynn. Authorities disagree both on the river's source and its length, with one quoting 160 mi (260 km)and another 143 mi (230 km). Mostly flowing north and east, it is the fifth longest river in the United Kingdom. The Great Ouse has been historically important for commercial navigation, and for draining the low-lying region through which it flows; its best-known tributary is the Cam, which runs through Cambridge. Its lower course passes through drained wetlands and fens and has been extensively modified, or channelised, to relieve flooding and provide a better route for barge traffic. The unmodified river would have changed course regularly after floods.

The name Ouse is from the Celtic or pre-Celtic *Udso-s, and probably means simply "water" or slow flowing river. Thus the name is a pleonasm. The lower reaches of the Great Ouse are also known as "Old West River" and "the Ely Ouse", but the entire length of the river is often referred to simply as the Ouse in informal usage (the word "Great" – which originally meant simply big or, in the case of a river, long – is used to distinguish this river from several others called the Ouse).

The River Wye (/waɪ/; Welsh: Afon Gwy [ɡʊɨ̯]) is the fourth-longest river in the UK, stretching some 250 kilometres (155 miles) from its source on Plynlimon in Mid Wales to the Severn Estuary. The lower reaches of the river form part of the border between England and Wales. The Wye Valley (lower part) is designated a National Landscape (formerly an Area of Outstanding Natural Beauty). The Wye is important for nature conservation and recreation, but is affected by pollution.