Wallers Haven is a slow flowing river in East Sussex that can be around 15 feet deep in places with the edges of the river lined with reeds. This is a very remote area and I strongly advise you do not go alone as it can be tricky to get in and out in certain stretches of the river. however its worth the experience as it remoteness makes it a truly rewarding wild swim experience.
drive towards bexhill on the A259. After pevensey roundabout with esso garage its about 4 minutes on the A259. it is the first bridge you come to. If you want you can pull over and park on the bridge at the side of the road.
You can swim either way on the river. I usually swim under the road bridge and then continue to a second bridge which you can jump off. If you go under this bridge there is a jetty just a bit further on which you can jump off. The river is very clean and deep in places. You can swim for as far as you want in either direction.