Porthleven is a town, civil parish and fishing port near Helston, Cornwall, England, United Kingdom. The most southerly port in Great Britain, it was a harbour of refuge when this part of the Cornish coastline was infamous for wrecks in the days of sail. The South West Coast Path from Somerset to Dorset passes through the town. The population at the 2011 census was 3,059.

Mount's Bay is a bay on the English Channel coast of Cornwall, England, stretching from the Lizard Point to Gwennap Head. In the north of the bay, near Marazion, is St Michael's Mount; the origin of name of the bay. In summer, it is a generally benign natural harbour. However, in winter, onshore gales present maritime risks, particularly for sailing ships. There are more than 150 known wrecks from the nineteenth century in the area. The eastern side of the bay centred around Marazion and St Michael's Mount was designated as a Marine Conservation Zone in January 2016.