The Natura 2000 area Mietoistenlahti is located in the municipality of Mynämäki, about 30 km north of Turku.

By car, the area can be reached from the Raisio-Kustavi road (no. 192), where there is signage to the site.

Parking areas are located at Saarentie (Saarentie, Mynämäki), Sillankari (Saarenrantatie, Mynämäki), and at the tower in Kuustonlahti (Kuustontie, Mynämäki). There are no exact addresses for the parking areas.

The nature trail starts from the parking area at Saarentie.