This natural reserves protects the Sado Estuary, a biologically rich area of wetlands extending east and south of Setúbal. With over 250 avian species, this is a prime spot for birdwatching. The little-visited Moinho de Maré das Mouriscas , located 8km east of Setúbal, has short walking trails and a bird observatory across the mudflats. It's set beside a former tide mill built in 1601, which also houses a gallery and cafe. You'll need a car to get here. Stop in the Municipal Turismo for exact directions.