Dosrius is a Spanish municipality in the autonomous community of Catalonia, located in the province of Barcelona, in the Maresme region.
The economy of the municipality is based on a highly diversified but scarce industry and on tourism. In the municipal term there are plenty of chalets for second homes, generally owned by inhabitants of Barcelona and Mataró.
Within the municipal area we find the town of Canyamars, located in a valley between the Corredor and Montalt mountains.