Lagoa do Roteiro is a large coastal lagoon located in the municipality of Roteiro, on the southern coast of Alagoas, Brazil, adjacent to Praia do Gunga. The lagoon sits between the Atlantic Ocean and the shoreline, separated from the open sea by coral reefs, and its waters shift in color depending on tidal conditions — appearing bluer at low tide and taking on a greener hue at high tide as ocean and lagoon waters intermingle.

The lagoon is well suited to paddling at all skill levels. Its waters are generally calm, making it appropriate for stand-up paddleboarding, kayaking, and windsurfing. Kayaks and small boats are available for rental at Praia do Gunga. One notable paddling route leads through the lagoon's mangrove channels toward the community of Vila Palatéia, offering close contact with one of the region's more ecologically rich ecosystems. The mangroves along this route support diverse wildlife and provide a quieter, more immersive experience away from the main tourist areas.

The lagoon is also navigable by larger vessels, and boat tours are a common activity. These tours typically include a stop at a sandbar that emerges in the middle of the lagoon, as well as access to natural reef pools between the lagoon and the ocean, where coral formations shelter small fish. The colorful sandstone cliffs (falésias) that line portions of the shoreline are a prominent visual feature of the landscape.

Praia do Gunga — the primary gateway to the lagoon — is accessible by boat from Barra de São Miguel or by car through a private property. The area supports local tourism infrastructure, including boat operators and nearby lodging options such as Gungaporanga Hotel.

The lagoon is located roughly 1 hour and 10 minutes by road from Maceió, making it a practical day trip from the state capital. Paddlers planning to operate registered vessels on Brazilian waters should be aware that the Brazilian Navy (DPC) requires a Vessel Inscription Title (TIE/TIEM) for recreational craft, and a federal fishing license is required for anyone intending to fish from a vessel.