Trosaån

The Trosaån flows east from Lake Sillen through Vagnhärad before dividing the town of Trosa into two sections on its path to the Baltic Sea.

The river's location influenced the relocation of Trosa town in the early 17th century due to post-glacial land rise, moving to its current position at the stream's estuary.

Small houses line certain sections of the Trosaån banks, forming part of the traditional Swedish coastal town layout within the Södermanland region.

The river basin extends over 572 square kilometers, following the D 800 road through Vagnhärad and continuing along the 218 road toward the sea.

During winter months, the surface of Trosaån freezes completely, transforming the flowing water into a solid corridor through the municipality.

Location: Trosa Municipality

GPS coordinates: 58.89378,17.55104

Latest update: November 3, 2025 18:37