Context: Berkshire (or , abbreviated Berks) is a county in south east England, west of London. It was recognised as the Royal County of Berkshire because of the presence of Windsor Castle by the Queen in 1957 and letters patent issued in 1974. Berkshire is a county of historic origin and is a home county, a ceremonial county and a non-metropolitan county without a county council. Berkshire County Council was the main county governance from 1889 to 1998 except for the separately administered County Borough of Reading., A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Small rivers can be referred to using names such as stream, creek, brook, rivulet, and rill. There are no official definitions for the generic term river as applied to geographic features, although in some countries or communities a stream is defined by its size. Many names for small rivers are specific to geographic location; examples are "run" in some parts of the United States, "burn" in Scotland and northeast England, and "beck" in northern England. Sometimes a river is defined as being larger than a creek, but not always: the language is vague., A sea is a large body of salt water that is surrounded in whole or in part by land. More broadly, "the sea" is the interconnected system of Earth's salty, oceanic watersconsidered as one global ocean or as several principal oceanic divisions. The sea moderates Earth's climate and has important roles in the water cycle, carbon cycle, and nitrogen cycle. Although the sea has been traveled and explored since prehistory, the modern scientific study of the seaoceanographydates broadly to the British "Challenger" expedition of the 1870s. The sea is conventionally divided into up to five large oceanic sectionsincluding the International Hydrographic Organization's four named oceans (the Atlantic, Pacific, Indian, and Arctic) and the Southern Ocean; smaller, second-order sections, such as the Mediterranean, are known as "seas"., Warwick is the county town of Warwickshire, England. The town lies upon the River Avon, south of Coventry and just west of Leamington Spa and Whitnash with which it is conjoined. At the 2011 United Kingdom census, it had a population of 31,345., Stratford-upon-Avon is a market town and civil parish in Warwickshire, England, on the River Avon, north west of London, south east of Birmingham, and south west of Warwick. The estimated population in 2007 was 25,505, increasing to 27,445 at the 2011 Census., Gloucestershire (; abbreviated Glos.) is a county in South West England. The county comprises part of the Cotswold Hills, part of the flat fertile valley of the River Severn, and the entire Forest of Dean., The River Stour is a river in Warwickshire , England . It is a tributary of the Avon , which it joins at Stratford - upon - Avon . The source of the River Stour is not , as sometimes stated , at Traitors Ford south - west of Sibford Gower but at a spring some 3 miles to the east near Highways Farm , just south of Swalcliffe in Oxfordshire . It joins the Avon close to Stratford racecourse . The first settlement that the river flows through is the village of Stourton . The River Stour then turns to the north and passes through the town of Shipston - on - Stour . The A3400 road roughly follows the course of the river to Stratford - upon - Avon , through the villages of Halford , Alderminster , Newbold - on - Stour , Atherstone - on - Stour and Clifford Chambers ., England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west. The Irish Sea lies northwest of England and the Celtic Sea lies to the southwest. England is separated from continental Europe by the North Sea to the east and the English Channel to the south. The country covers five-eighths of the island of Great Britain (which lies in the North Atlantic) in its centre and south; and includes over 100 smaller islands such as the Isles of Scilly, and the Isle of Wight., A County town is usually the location of administrative or judicial functions within the county, or it has been established over time as the "de facto" main town of a county. The concept of a county town eventually became detached from its original meaning of where the county administration or county hall is based. In fact, many county towns are no longer part of the administrative county. For example, Nottingham is administered by a unitary authority entirely separate from the rest of Nottinghamshire. Many county towns are classified as cities, but all are referred to as county towns regardless of whether city status is held or not., A tributary or affluent is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drainage basin of its surface water and groundwater, leading the water out into an ocean., South East England is the most populous of the nine official regions of England at the first level of NUTS for statistical purposes. It consists of Berkshire, Buckinghamshire, East Sussex, Hampshire, the Isle of Wight, Kent, Oxfordshire, Surrey and West Sussex. As with the other regions of England, apart from Greater London, the south east has no elected government., Oxfordshire (or ; abbreviated Oxon) is a county in South East England bordering on Warwickshire (to the north/north-west), Northamptonshire (to the north/north-east), Buckinghamshire (to the east), Berkshire (to the south), Wiltshire (to the south-west) and Gloucestershire (to the west)., "Main Stem" is 1942 instrumental by Duke Ellington and His Famous Orchestra. Although recorded in 1942, the single would not be released until 1944 where it was Duke Ellington's last of four number one's on the Harlem Hit Parade. "Main Stem" also peaked at number twenty on the pop chart., Warwickshire (or ) is a landlocked county in the West Midlands of England. The county town is Warwick, although the largest town is Nuneaton. The county is famous for being the birthplace of William Shakespeare. Commonly used abbreviations for the county are Warks or Warwicks., A drainage basin or catchment basin is an extent or an area of land where all surface water from rain, melting snow, or ice converges to a single point at a lower elevation, usually the exit of the basin, where the waters join another body of water, such as a river, lake, reservoir, estuary, wetland, sea, or ocean. Thus if a tributary stream joins a brook that in turn joins a small river which is a tributary of a larger river, there is a series of successively larger (and lower elevation) drainage basins. For instance, the Missouri and Ohio rivers are within their own drainage basins and also within the drainage basin of the Mississippi River., An ocean (the sea of classical antiquity) is a body of saline water that composes much of a planet's hydrosphere. On Earth, an ocean is one of the major conventional divisions of the World Ocean, which covers almost 71% of its surface. These are, in descending order by area, the Pacific, Atlantic, Indian, Southern (Antarctic), and Arctic Oceans. The word "sea" is often used interchangeably with "ocean" in American English but, strictly speaking, a sea is a body of saline water (generally a division of the world ocean) partly or fully enclosed by land., Subject: river stour, Relation: mouth_of_the_watercourse, Options: (A) celtic sea (B) english channel (C) isle (D) main (E) mississippi river (F) river avon (G) sea (H) severn
Output: river avon