An amateur enthusiast steadily films a boat trip from Falmouth around the Fal estuary and to St Mawes on the Roseland peninsula, the word ros meaning promontory. Roseland is seperated from the rest of the county of Cornwall by the River Fal. The natural harbour at Falmouth is the third deepest in the world after Rio de Janeiro and Sydney. The port and its Packet Quays grew around one estate, Arwenack which belonged to the Killigrew family.