The Lyne Water is a tributary of the River Tweed that rises in the Pentland Hills of southern Scotland at Baddinsgill Reservoir. It runs through West Linton and Romannobridge, passes Flemington and Lyne Station and enters the Tweed west of Peebles. It floods regularly in winter and occasionally in summer. There is free fishing above Flemington Bridge, and below Flemington fishing in the river is administered by the Peebles fishing authority.

The name Lyne was recorded first as Lyn in around 1190,^[1] and is of Brittonic origin.^[1] Unlike most rivers named Lyne, it is derived from lïnn, generally meaning "a pool" (Welsh llyn).^[1] Alternative etymology includes Llyn (^circumflex over y) which can look like Lyn but pronounced “Lainn” or “leen” meaning in Scots Gaelic Laighin or Lainn “a spear or blade”. Ll^yn/Lleyn/Lainn is the Cumbric Welsh spelling of Laighin or Lainn similar to the Ll^yn Peninsula Llŷn Peninsula in North Wales in the old kingdom of Gwynedd. The Ui Laighin settled there. But the Ui Laighin were also Brigantes Celts the Uí Bairrche in both Leinster and North Britain up to and slightly beyond Hadrians Wall and Ptolemy’s map identify the Brigantes Celts in both areas of the British Isles. These Brigantes were also Laighin (pronounced “Lainn”) and took surname forms later of Laing, Layng, Lainn, Lyne, Lynes, Lyons, Lane, Leyne, Leing, Leen, etc. The River White Lyne and Black Lyne in Cumbria East of Carlisle and West of Bewcastle and Lynes hamlet near Bewcastle to the SW also has the same Laighin/Ll^yn/Leyne/Lainn etymology although these rivers were also called Leven/Levan from Gaelic “Liamhain” meaning Elm/Scots Elm tree. Ancient the area was called Leven but both etymologies are possible and fit with the existence of both Gaelic and Cumbric Welsh spoken in these regions anciently especially with the Brigantes Celts who also were called Galeion or Coriondi or Laighin in both regions. Additionally the Ui Dunlaing were a leading king kindred of Leinster or Ui Laighin and is another similar origin as Laing and Lainn meaning “spear or blade” which was their tribal kindred name. The Corionototae were noted on a Roman inscription near Hadrians Wall as well which is similar to Coriondi in Leinster Ireland. Anciently people called things by sound and descriptive meaning of the names of regions, peoples, rivers, hills, place names, etc

• Lyne
• Lyne Kirk
• Lyne Viaduct
• List of places in the Scottish Borders
• List of places in East Lothian
• List of places in Midlothian
• List of places in West Lothian

• RCAHMS: Border Union Railway, River Lyne Bridge to Harker Section
• Historic Environment Scotland. "Ledbeg River Chambered Cairn (4642)". Canmore.
• SCRAN: View of West Linton from the ford of the River Lyne (West Linton Historical Association)
• Roman fort, fortlet and camps at Hallyne, Lyne
• Lyne Farm

55°37′N 3°16′W / 55.617°N 3.267°W / 55.617; -3.267