Matsalu National Park is a nature reserve and national park situated in the Lääne and Pärnu counties of Estonia. Matsalu National Park spans an area of 486.1 km2, comprising Matsalu Bay, the Kasari River delta, the village of Matsalu and surrounding areas. Matsalu Bay is one of the most important wetland bird areas in Europe, due to its prime position on the East Atlantic Flyway. Large numbers of migratory birds use Matsalu as a staging area.