The River Dee rises at Lake Bala [Map] from where it flows under Pont Fawr, Denbighshire [Map], past Crogen, Denbighshire [Map], Cynwyd, Denbighshire [Map], Corwen, Denbighshire [Map], Carrog, Denbighshire [Map], Llangollen [Map], under the Pontcysyllte Aqueduct [Map], under Overton Bridge [Map], and Bangor-on-Dee Bridge [Map], past Holt Castle [Map] to Chester [Map] after which it flows past Queensferry, Flintshire [Map] and Flint Castle [Map] before joining the Irish Sea.

1036. The earliest reports of a bridge over the River Dee at or near Bangor-on-Dee Bridge [Map] in historical maps date to 1036.

1292. The earliest mention of a medieval wooden bridge at Bangor-on-Dee Bridge [Map] was recorded in 1292.

1500. The current bridge at Bangor-on-Dee Bridge [Map] is of medieval late 15th or early 16th century origins. the current structure mainly dates to the 17th century, with a notable restoration in 1658, by Inigo Jones.