Lower Tamar Lake is a 35 acre reservoir located on the Devon-Cornwall border, in England, near Thurdon.

To the north (upstream) is the newer Upper Tamar Lake,[1] a reservoir used for public water supply.

The county boundary originally ran along the (natural) route of the River Tamar, but was re-aligned along a (now disused) re-routing of the river to the reservoir's west side, placing the lake in Devon.

This is a path following the canal that reaches a small building showing the history of the lake.

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