Lake Cahuilla
... that Lake Cahuilla, with a maximum surface area of 5,700 square kilometres (2,200 sq mi), covered parts of Southern California less than 500 years ago?
... that <b id="mwBUk"><a href="./Lake_Cahuilla" id="mwBUo" rel="mw:WikiLink" title="Lake Cahuilla">Lake Cahuilla</a></b>, with a maximum surface area of 5,700 square kilometres (2,200 sq mi), covered parts of <a href="./Southern_California" id="mwBUs" rel="mw:WikiLink" title="Southern California">Southern California</a> less than 500 years ago?