border between Wales and England
... that the border between Wales and England has followed broadly the line of Offa's Dyke since the 8th century, but was only finally determined in law in 1972?
... that the <b id="mwkw"><a class="mw-redirect" href="./Wales-England_border" id="mwlA" rel="mw:WikiLink" title="Wales-England border">border between Wales and England</a></b> <i id="mwlQ">(The <a href="./River_Dee,_Wales" id="mwlg" rel="mw:WikiLink" title="River Dee, Wales">River Dee</a> pictured)</i> has followed broadly the line of <a href="./Offa's_Dyke" id="mwlw" rel="mw:WikiLink" title="Offa's Dyke">Offa's Dyke</a> since the 8th century, but was only finally determined in law in 1972?