South Branch Kishwaukee River
... that part of the bed of South Branch Kishwaukee River in Illinois was the plain of an ancient lake?
... that part of the <a href="./Stream_bed" id="mwkQ" rel="mw:WikiLink" title="Stream bed">bed</a> of <b id="mwkg"><a href="./South_Branch_Kishwaukee_River" id="mwkw" rel="mw:WikiLink" title="South Branch Kishwaukee River">South Branch Kishwaukee River</a></b> in <a href="./Illinois" id="mwlA" rel="mw:WikiLink" title="Illinois">Illinois</a> was the plain of an <a href="./Ancient_lake" id="mwlQ" rel="mw:WikiLink" title="Ancient lake">ancient lake</a>?