Lopwell Dam Local Nature Reserve coves an area of 5 hectares on the River Tavy near Plymouth and Tavistock. It consists of a variety of different habitats including mudflats, freshwater marsh, wildflower meadow, scrub-grassland, saltmarsh and semi-natural woodland. It's great for riverside walking and bird watching and includes a new cafe and visitor centre.
The Tamar Valley Discovery Trail passes the reserve so you can pick this up to extend your walk. The trails runs north to Bere Alston and south to Tamerton Foliot.
Also nearby is the Tamar Estuary Nature Reserve with lots more wading birds to look out for.