Aquis Querquennis
... that the Roman fort Aquis Querquennis periodically emerges from a reservoir?
... that the Roman fort <b id="mw4A"><a href="./Aquis_Querquennis" id="mw4Q" rel="mw:WikiLink" title="Aquis Querquennis">Aquis Querquennis</a></b> periodically emerges from a reservoir?