Lava River Cave
... that the Lava River Cave in Newberry National Volcanic Monument is the longest known uncollapsed lava tube in Oregon, U.S.?
... that the <b id="mwBPM"><a href="./Lava_River_Cave" id="mwBPQ" rel="mw:WikiLink" title="Lava River Cave">Lava River Cave</a></b> in <a href="./Newberry_National_Volcanic_Monument" id="mwBPU" rel="mw:WikiLink" title="Newberry National Volcanic Monument">Newberry National Volcanic Monument</a> is the longest known uncollapsed <a href="./Lava_tube" id="mwBPY" rel="mw:WikiLink" title="Lava tube">lava tube</a> in <a href="./Oregon" id="mwBPc" rel="mw:WikiLink" title="Oregon">Oregon</a>, U.S.?