English trees & bushes on the left & Scottish trees & bushes on the right, as a burn/beck/stream/brook marks the national boundary ( along a "B" road between Cornhill-on-Tweed & Kelso). Although the River Tweed serves as the Anglo/Scottish Border for a short distance, once it approaches the North Sea, the border swings north, leaving both Berwick-upon-Tweed on the river's northern bank & Tweedmouth on its southern, both in England. By Kelso, both sides of the Tweed are in Scotland.  Only at Coldstream, does a crossing of the river take you between the two countries.