Given the task definition and input, reply with output. In this task, you are given a context, a subject, a relation, and many options. Based on the context, from the options select the object entity that has the given relation with the subject. Answer with text (not indexes).

Context: The Thames Estuary is the estuary in which the River Thames meets the waters of the North Sea, in the south-east of Great Britain., Higham / ha.m / is a large village , and electoral ward bordering the Hoo Peninsula , in Kent , between Gravesend and Rochester . The civil parish of Higham is in Gravesham district and as at the 2001 UK Census , had a population of 3,938 , increasing slightly to 3,962 at the 2011 Census ., Kent is a county in South East England and one of the home counties. It borders Greater London to the north west, Surrey to the west, East Sussex to the south west, and Essex across the Thames Estuary to the north. The county town is Maidstone. , 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., East Sussex is a county in South East England. It is bordered by the counties of Kent to the north and east, Surrey to the north west and West Sussex to the west, and to the south by the English Channel., 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., Maidstone is the county town of Kent, England, south-east of London. The River Medway runs through the centre of the town, linking it with Rochester and the Thames Estuary. Historically, the river was a source and route for much of the town's trade as the centre of the agricultural county of Kent, known as the Garden of England. There is evidence of a settlement in the area dating back to before the Stone Age., Gravesham is a local government district with borough status in north-west Kent, England. Its administrative centre and largest town is Gravesend, which was known as "Gravesham" in ancient times., Sussex (abbreviated Sx), from the Old English "Sþsaxe" (South Saxons), is a historic county in South East England corresponding roughly in area to the ancient Kingdom of Sussex. It is bounded to the west by Hampshire, north by Surrey, north-east by Kent, south by the English Channel, and divided for local government into West Sussex and East Sussex and the city of Brighton and Hove. Brighton and Hove was created as a unitary authority in 1997, and granted City status in 2000. Until then, Chichester was Sussex's only city., Subject: higham, Relation: located_next_to_body_of_water, Options: (A) english channel (B) irish sea (C) main (D) north sea (E) river medway (F) river thames
river thames