Abbey of the Dunes
Koksijde, Belgium · built 1107
Ten Duinen Abbey or the Abbey of the Dunes (Abdij Ten Duinen) was a Cistercian monastery at Koksijde in what is now Belgium. It was one of the richest and most influential religious institutions in the medieval County of Flanders. It later relocated from Koksijde to the city of Bruges.
Monastery data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).