Vaestaboland is a locality in the Southwest Finland region of Finland. It lies in the Archipelago Sea, the archipelago commonly cited as the largest in the world by number of islands, with roughly 50,000 islands.
The area forms part of the municipality of Pargas, a town and municipality of Finland. Pargas is known for a large limestone mine, which serves as the base of its main industry. Outside the central built-up areas, the municipality remains largely rural.