A little to the north is the great artificial cut carrying the waters of the river Nene; and the neighbourhood is intersected with many other navigable "drains."
Thus, from north to south there are, on the east coast, the mouths of the Tyne and the Tees, the Humber estuary, the Wash (which receives the waters of the Witham, Welland, Nene and Great Ouse), the Orwell-Stour, Blackwater and ThamesMedway estuaries.
The Nene on the south-east has but a small portion of its course in Lincolnshire; it flows due north through an artificial outfall, called the Wisbech Cut.
Between the Welland and the Nene in the south-east of the county are Gedney Marsh, Holbeach Marsh, Moulton Marsh and Sutton Marsh.
It lies in the flat fen country, on the river Nene (mainly on the east bank), II m.