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The Tamar's source is less than 4 miles (6 km) from the north Cornish coast, but it drains southward. North of the source the Cornish border heads to the sea along Marsland Water , making Cornwall nearly an island.

In a few places the border deviates from the river, leaving, for instance, the Devon village of Bridgerule on the 'Cornish' side. Curiously, the modern administrative border between Devon and Cornwall more closely follows the Tamar than the traditional border. Several villages north of Launceston which are west of the Tamar were actually in Devon until the 1960s.

The River TavyThe Tavy is a river on Dartmoor, Devon, England It is a tributary of the River Tamar and has as its own tributaries the: Collybrooke River Burn River Wallabrooke River Lumburn River Walkham. Bibliography The Painted Stream Robin Armstrong, Dent, 1985, ISB is a tributaryA tributary (or affluent or confluent is a contributory stream, a river that does not reach the sea, but joins another major river (a parent river), to which it contributes its waters, swelling its discharge. A tributary joins another river at a confluenc to the Tamar.

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• The Tamar RiverThe Tamar River in northern Tasmania starts at Launceston, at the joining of the North Esk River and South Esk River. It is named for the River Tamar in Cornwall, UK It flows north, approximately 70 km, the mouth of the river flowing in to Bass Strait at in TasmaniaTasmania State flag ( In detail) Coat of Arms ( Full size) Capital Hobart Governor William Cox (Acting Governor) Premier Paul Lennon Area — Land — Marine — Total 68 401 km² 22 357 km² 90 758 km² Population(Sep 2003) Density 478 400 6. 92/km² Time zone UTC was named after the Tamar in Cornwall.
• Rivers of the United Kingdom