The municipality contains part of the Cassurubá Extractive Reserve, a 100,768 hectares (249,000 acres) sustainable use conservation unit that protects an area of mangroves, river and sea where shellfish are harvested.[2]
The Timbebas reef opposite Alcobaça is part of the 91,330 hectares (225,700 acres) Abrolhos Marine National Park, a conservation unit created in 1983.[3]