system of ravines
...that because of its system of ravines, Toronto has been described as "San Francisco turned upside down"?
...that because of its <b id="mwBNE"><a href="./Toronto_ravine_system" id="mwBNI" rel="mw:WikiLink" title="Toronto ravine system">system of ravines</a></b>, <a href="./Toronto" id="mwBNM" rel="mw:WikiLink" title="Toronto">Toronto</a> has been described as "<a href="./San_Francisco" id="mwBNQ" rel="mw:WikiLink" title="San Francisco">San Francisco</a> turned upside down"?