Just 7 miles long and running roughly north-south, the A707 is a link between Tweeddale (usually taken to be the upper reaches of the river) and Selkirk, and can also be used as part of an alternative to the A7 through Galashiels. It is wholly in the historical county of Selkirkshire.
The A707 crosses the River Tweed on Yair Bridge
At its northern end the A707 starts at The Nest Roundabout on the A72 a mile south west of the village of Clovenfords, and closely follows the north bank of the River Tweed for several miles as it winds south eastwards. At Caddonfoot, about a mile from the start, the route crosses the small Caddon Water at Caddonfoot Bridge and then turns sharp right, with the B710 turning left, cutting back to the centre of Clovenfords. The next section is a particularly attractive stretch along the river in its narrow valley between wooded hills. After running southwards for almost a mile, the route then curves back to the south east to reach the traffic light-controlled Yair Bridge over the Tweed at Fairnilee. The A707 has to take a double bend to cross the narrow bridge, with the B7060 continuing along the north bank of the Tweed to join the A7 between Galashiels and Selkirk.
The route then follows the south bank of the river for half a mile or so, before starting to climb away from the riverbank, to cross a shoulder of high ground which sits in the V of the confluence between the Tweed and Etterick. After reaching a summit of around 170m, the route starts to descend into the valley of the Ettrick Water, passing a scattering of farms as it winds down the hillside into the outskirts of Selkirk. After passing the out-of-town Bannerfield housing scheme on the north bank of the river, the route turns hard left on Linglie Road at a former TOTSO, with the road ahead originally being a spur of the A708, but now closed up. The A708 now solely meets the A707 at the next junction on the right, where it doubles back a little to follow the Yarrow Water, a tributary of the Etterick, upstream. The A707, meanwhile, crosses the Ettrick on Selkirk Bridge, and makes a long winding climb into the centre of Selkirk on its high ridge.
Just on the south side of the bridge, the B7014 heads off to the left, avoiding the town centre to join the A7 to the north, the route then climbs Yarrow Terrace, passing a junction with the B7009 from Ettrickbridge on the right. The two routes then enjoy a short multiplex along Heatherlie Terrace before the B7009 leaves to the left at The Green to quickly join the B7014. After a final climb along The Green and West Port, the route ends in Selkirk Square where the A7 has one of several sharp bends through the town, from this point going left for Galashiels and straight on for Hawick.