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Plymouth Sound,deep inlet of the English Channel, Devon and Cornwall, SW England. It is a famous roadstead and forms a bay c.3 mi (5 km) wide. It receives the Tamar River through the Hamoaze estuary and the Plym River through the Cattewater estuary. A breakwater, c.2 mi (3 km) long, protects the harbor. The inlet has been protected by forts for centuries. PlymouthPlymouth,
city and unitary authority (1991 pop. 238,583), SW England, on Plymouth Sound. The three towns that Plymouth has comprised since 1914 are Plymouth, Stonehouse, and Devonport; the suburbs of Plympton and Plymstock were added to the city in 1967.
..... Click the link for more information. , long a major port, is located at its head.
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