Blackadder Water below Greenlaw
Adder may be derived from Brittonic *ador, *edir or Old English edre, possible ancient hydronymic terms derived from an Indo-European formation meaning "a watercourse, a channel" (compare River Etherow). From the possible Old English derivation of ?dre, "a vein" (Anglian ?dre), or *?dre, meaning "quickly", arises objections on the basis that these would have maintained the long initial vowel in English and Scots.
Rising in the Harecleugh Forest plantation just south of the Twin Law cairns, north of the village of Westruther, the headwaters of the Blackadder join with those of the Wedderlie, Edgar, and Fangrist Burns, before reaching the town of Greenlaw. The river proceeds in a meandering path through the Merse until it meets with the Langton Burn between the estates of Kimmerghame House and Wedderburn Castle. The Blackadder later becomes a tributary of the Whiteadder Water and joins with that river at the village of Allanton, where Blackadder House and its estate once stood.
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