The River Tweed (156 Kilometers long) flows primarily through the Borders[?] region of Scotland. Its lower reaches mark the Scots border with England for 27 kilometers near Berwick-upon-Tweed.
... (roughly the place of articulation of English alveolars like t, but with the tongue curled back) (t, th, d, dh, n)
Dental (tongue against teeth, like Spanish) ...