Hudson River Historic District
...that the Hudson River Historic District is, at 35 square miles (89 km²), the largest Registered Historic District in the contiguous United States?
...that the <b id="mwOg"><a href="./Hudson_River_Historic_District" id="mwOw" rel="mw:WikiLink" title="Hudson River Historic District">Hudson River Historic District</a></b> is, at 35 <a href="./Square_mile" id="mwPA" rel="mw:WikiLink" title="Square mile">square miles</a> (89 km²), the largest <a href="./National_Register_of_Historic_Places" id="mwPQ" rel="mw:WikiLink" title="National Register of Historic Places">Registered Historic District</a> in the <a class="mw-redirect" href="./Continental_United_States" id="mwPg" rel="mw:WikiLink" title="Continental United States">contiguous United States</a>?