River Plym
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The River Plym is a small river in Devon, England. Its source is 450 m above sea level on Dartmoor, in an upland marshy area called Plym Head. The river flows roughly south west and enters the sea near (and gives a name) to the city of Plymouth. It is approximately 30km long. The name Plym is thought to have its origins in Old English and means the 'plum tree'
HMS Plym (F271), a River-class antisubmarine frigate, was named after the river during World War II. It carried out convoy escort duties in the North Atlantic and was later destroyed in the UK's first nuclear explosion.