© All rights reserved (by me the photographer - Dr. David J. Otway)
taken from FR203 STN-DUB 11-08-2007 @ 6.50 am (about 20000ft up) and at full digital zoom through a fairly grotty window.
The centre body of water is The Wash (which is in England) - with Hunstanton on the upper coastline of that.
From the wikipedia on The Wash :-
The Wash is the square-mouthed estuary on the northwest margin of East Anglia on the east coast of England, "where Norfolk meets Lincolnshire". It is among the largest estuaries in the United Kingdom. It is fed by the Rivers Witham, Welland, Nene and Great Ouse.
The Wash shows as a large indentation in the coastline of the map of eastern England, separating the curved coast of East Anglia from Lincolnshire. It is formed by a large bay with three roughly straight sides meeting at right angles, each about 25 kilometres (15 miles) in length. The eastern coast of the Wash is entirely within Norfolk, and extends from Hunstanton in the north to the mouth of the River Great Ouse at King's Lynn in the south. The opposing coast, which is roughly parallel to the east coast, runs from Gibraltar Point to the mouth of the River Welland, all within Lincolnshire. The southern coast runs roughly northwest-southeast, connects these two river mouths, and is punctuated by the mouth of a third river, the River Nene.
Inland from the Wash the land is flat, low-lying, and often marshy: these are the Fens of Lincolnshire, Cambridgeshire and Norfolk.
Owing to deposits of sediment, the coastline of the Wash has altered markedly within historical times; several towns once on the coast of the Wash (notably King's Lynn) are now some distance inland. Much of the Wash itself is very shallow, with several large sandbanks—such as Breast Sand, Bulldog Sand, Roger Sand, and Old South Sand—exposed at low tide, especially along its south coast. For this reason, navigation in the Wash can be hazardous for boats. A lightship marks the entrance to the Lynn Channel, the one safe channel from the North Sea to The Wash's south coast.
the river channels in the bottom of the picture are "drains" in Lincolnshire
a map of this on google :-)