the marshes run along both sides of the river, the northern portion next to hornchurch country park and stretching south to rainham. this is almost all closed to the public, but part of it can be viewed from the park. a long narrow strip stretches east from the river to berwick pond road, incorporating berwick pond, a reservoir which is used for fishing. this is open to the public. the site also includes an irrigation reservoir east of berwick pond road.