Amwell Magna Fishery is located on the River Lea at Amwell which is 1.5 miles (2.4 km) south of Ware in Hertfordshire county of eastern England.
The fishery was established in 1841 and is the oldest fly fishing club in the UK still fishing the same water. The river was fished by Izaak Walton author of The Compleat Angler in the 17th century. The fishery has faced many problems over the years including gravel extraction, flood alleviation schemes and a major pollution in 1965.
The fishery is the one of the closest rivers to Central London where wild trout can be caught and was featured in the BBC series Rivers which was broadcast in 2009.