the Mardyke
... that although its name means boundary ditch, the Mardyke is actually a river that flows into the Thames at Purfleet?
... that although its name means boundary ditch, <b id="mwFx4"><a href="./Mardyke_(river)" id="mwFx8" rel="mw:WikiLink" title="Mardyke (river)">the Mardyke</a></b> is actually a river that flows into the <a class="mw-redirect" href="./Thames" id="mwFyA" rel="mw:WikiLink" title="Thames">Thames</a> at <a href="./Purfleet" id="mwFyE" rel="mw:WikiLink" title="Purfleet">Purfleet</a>?