Amwell Magna Fishery sits on the River Lea at Great Amwell, approximately 1. 5 miles south of Ware in Hertfordshire. Established in 1831, it is recognised as the oldest fly fishing club in the United Kingdom still fishing the same water.

The club manages a two-mile stretch of the original River Lea running between Ware and the village of Stanstead Abbotts — one of the few remaining sections of the unmodified river still flowing south from Hertford.

The fishery is historically significant as the water fished by Izaak Walton in the 17th century, described in his celebrated work The Compleat Angler .

It remains one of the closest rivers to central London where wild brown trout can be caught, and it is considered the last stretch of the Lea where brown trout still spawn naturally in autumn.

In recent years the club has been actively engaged in efforts to restore adequate water flows, which have been reduced by abstraction, canalisation, and flood defence infrastructure throughout the Lea Valley.