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The Hamoaze is an estuarine stretch of the tidal River Tamar, between its confluence with the River Lynher and Plymouth Sound.
The Hamoaze flows past HMNB Devonport, which is one of three major bases of the Royal Navy today. The presence of large numbers of small watercraft are a challenge and hazard to the warships using the naval base and dockyard. Navigation on the waterway is controlled by the Queen's Harbour Master for Plymouth.
Settlements on the banks of the Hamoaze are Saltash, Wilcove, Torpoint and Cremyll in Cornwall, as well as Devonport and Plymouth in Devon.
Two regular ferry services crossing the Hamoaze exist: the Torpoint Ferry (a chain ferry that takes vehicles) and the Cremyll Ferry (passengers and cyclists only).

The Tamar (Cornish: Dowr Tamar) is in south west England, it forms most of the border between Devon and Cornwall.
The Tamar's source is 3 miles from the north Cornish coast, but it flows southward and its course runs across the peninsula to the south coast. The total length of the river is 61 miles. At its mouth, the Tamar flows into the Hamoaze before entering Plymouth Sound. Tributaries of the river include the rivers Inny, Ottery, Kensey and Lynher (or St Germans River) on the Cornish side, and the Deer and Tavy on the Devon side.