Coordinates: 50°22′44″N 4°15′50″W / 50.379°N 4.264°W
The River Lynher (Cornish: Linar) (or St Germans River downstream from its confluence with the Tiddy) flows through east Cornwall, England, and enters the River Tamar at the Hamoaze, which in turn flows into Plymouth Sound.
The normal tidal limit is a weir upstream of Notter Bridge.St Germans is a historic fishing village situated on the River Tiddy just upstream of its confluence with the Lynher. The Quay Sailing Club are based at St Germans Quay. The Queen's Harbour Master for Plymouth is responsible for managing navigation on the tidal Lynher and its tributaries (up to the normal tidal limits).
The river is about 21 miles (34 km long), rising at a height of about 920 feet (280m) on Bodmin Moor and flowing into the Tamar Estuary near Plymouth. It has four main tributaries, the largest of which is the River Tiddy. The smaller tributaries include Deans Brook, Withey Brook, Marke Valley and Darleyford streams and Kelly Brook.