Horse Eye Sewer

Glynleigh Sewer is a river in Hailsham, Wealden District, East Sussex, England. Located partly in the Pevensey Levels, Glynleigh Sewer joins Hurst Haven to form the Pevensey Haven. The river forms much of the boundary between the civil parishes of Westham and Hailsham.

Hurst Haven is a 10.2-kilometre (6.3 mi) long river in Hailsham, Wealden District, East Sussex, England. Located partly in the Pevensey Levels, Hurst Haven joins Glynleigh Sewer to form the Pevensey Haven.

Down Sewer is a 1.3-kilometre (0.81 mi) long river in the Wealden District of East Sussex, England, that is a tributary to Hurst Haven. Located in the Pevensey Levels, it rises from White Dyke Sewer and flows a southeasterly course.

Drockmill Hill Gut is a 3.1-kilometre (1.9 mi) long river in the Wealden District of East Sussex, England, that is a tributary to Glynleigh Sewer. It is partly located in the Pevensey Levels.

Puckeridge Stream is a minor river (brook) and drainage ditch of the Pevensey Levels in Hailsham, Wealden District of East Sussex, England. The river is a tributary to Hurst Haven, itself a tributary of Pevensey Haven. Puckeridge Stream has multiple tributaries itself, including Magham Sewer and Bowley Sewer.

White Dyke Sewer, also known as simply White Dyke, is a 1.9-kilometre (1.2 mi) long stream (brook) and drainage ditch of the Pevensey Levels in Hailsham, Wealden District of East Sussex, England, that is a tributary to Horse Eye Sewer.

Magham Sewer is a minor, 2.2-kilometre (1.4 mi) long river (brook) and drainage ditch of the Pevensey Levels in the civil parish of Hailsham, Wealden District of East Sussex, England, that is a tributary of Puckeridge Stream. The river acts as a drainage basin for several smaller ditches, including streams from Puckeridge Stream.

Chilley Stream is a minor, 3.41-kilometre (2.12 mi) long stream (brook) of the Pevensey Levels in Hailsham, in the Wealden District of East Sussex, England. It is a tributary of Pevensey Haven. Rising from Burgh Fleet and Monkham Sewer, Chilley Stream acts as a drainage ditch for several minor streams—including the distributary Manxey Sewer—although many of which are unnamed.

Bowley Sewer is a minor, 1.8-kilometre (1.1 mi) long river (brook) and drainage ditch of the Pevensey Levels in Hailsham, Wealden District of East Sussex, England. It is a tributary of Puckeridge Stream, which itself is a tributary of Hurst Haven.

Lewens Sewer is a minor, 1.1-kilometre (0.68 mi) long stream (brook) and drainage ditch of the Pevensey Levels in Hailsham, Wealden District of East Sussex, England, that is a tributary to Horse Eye Sewer. Flowing northeasterly throughout its entire course, Lewens Sewer rises at the confluence of Crossing Sewer and White Dyke Sewer near the White Dyke Marsh marshland. It has two left tributaries that drain water from an unnamed ditch draining Horse Eye Sewer, and two right tributaries that direct water into White Dyke Sewer.

Sackville Sewer is a minor, 1.7-kilometre (1.1 mi) long river (brook) and drainage ditch of the Pevensey Levels in Hailsham, Wealden District of East Sussex, England, that is a tributary to Bowley Sewer.

Pevensey Levels is a 3,603.2-hectare (8,904-acre) biological Site of Special Scientific Interest between Bexhill-on-Sea and Hailsham in East Sussex. It is a Nature Conservation Review site, Grade I, a Ramsar site and a Special Area of Conservation. An area of 183.5 hectares (453 acres) is a national nature reserve and an area of 150 hectares (370 acres) is a nature reserve called Pevensey Marshes which is managed by the Sussex Wildlife Trust.This is a large area of wetland grazing meadows intersected by a network of ditches. It has many nationally rare invertebrates. It may be the best site in Britain for freshwater mollusc fauna, including the endangered shining ram's-horn snail. It also has one nationally rare and several nationally scarce aquatic plants and it is of national importance for lapwing, with more than 1% of the British population.