chashi
... that over five hundred Ainu hilltop forts, known as chashi, have been identified in Hokkaidō?
... that over five hundred <a href="./Ainu_people" id="mwA40" rel="mw:WikiLink" title="Ainu people">Ainu</a> hilltop forts, known as <i id="mwA44"><b id="mwA48"><a href="./Chashi" id="mwA5A" rel="mw:WikiLink" title="Chashi">chashi</a></b></i>, have been identified in <a class="mw-redirect" href="./Hokkaidō" id="mwA5E" rel="mw:WikiLink" title="Hokkaidō">Hokkaidō</a>?