Biggar Water is a river in Lanarkshire and Peeblesshire, in the Southern Uplands of Scotland.

It forms part of the River Tweed system.

It then flows about 5 miles (8.0 km) eastwards before its confluence with the Tweed 3⁄4 mile (1.2 km) mile north-east of Drumelzier in Peeblesshire.

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