St Mawes (Cornish: Lannvowsedh) is a little village opposite Falmouth, on the Roseland Peninsula upon the south coast of Cornwall, ,United Kingdom. It lies upon the east bank of the Carrick Roads, a large waterway created after the Ice Age from an ancient valley which flooded as the melt waters caused the sea level to rise dramatically. The Big natural harbour created is often claimed to be the third largest in the world. It was past a thriving fishing port, but the trade declined during the 20th century and it now serves as a popular tourist location, with many properties in the village functioning as holiday accommodation. The village is in the civil parish of St Just in Roseland.
A year-round ferry provides a further to Falmouth, which is less than a mile away by boat, but due to its proximity to the Fal estuary it is some 30 miles (48 km) away by road. The area Ferry contacts the South West Coast Path and operates from Good Friday to the halt of October.