Chetco River
... that the world's northernmost grove of Redwood trees is located in the Chetco River watershed and includes specimens reaching over 300 feet (91 m) tall?
... that the world's northernmost grove of <a href="./Sequoia_(genus)" id="mwGcM" rel="mw:WikiLink" title="Sequoia (genus)">Redwood</a> trees is located in the <b id="mwGcQ"><a href="./Chetco_River" id="mwGcU" rel="mw:WikiLink" title="Chetco River">Chetco River</a></b> watershed and includes specimens reaching over <span about="#mwt52" data-mw='{"parts":[{"template":{"target":{"wt":"convert","href":"./Template:Convert"},"params":{"1":{"wt":"300"},"2":{"wt":"ft"},"3":{"wt":"m"}},"i":0}}]}' id="mwGcY" typeof="mw:Transclusion">300 feet (91</span><span about="#mwt52" typeof="mw:Entity"> </span><span about="#mwt52">m)</span> tall?