Great Wall of Vietnam
... that at 127.4 kilometres (79.2 mi) long, the Great Wall of Vietnam is the longest monument in Southeast Asia?
... that at 127.4 kilometres (79.2 mi) long, the <b id="mwEfw"><a class="mw-redirect" href="./Long_Wall_of_Quang_Ngai" id="mwEf0" rel="mw:WikiLink" title="Long Wall of Quang Ngai">Great Wall of Vietnam</a></b> is the longest monument in Southeast Asia?