Ottawa-Bonnechere Graben
...that the Ottawa-Bonnechere Graben across Ontario from Montreal to Lake Nipissing, a depression formed by ancient faults, is a failed arm of the ancestor of the Atlantic Ocean?
...that the <b id="mwCzA"><a href="./Ottawa-Bonnechere_Graben" id="mwCzE" rel="mw:WikiLink" title="Ottawa-Bonnechere Graben">Ottawa-Bonnechere Graben</a></b>  across <a href="./Ontario" id="mwCzI" rel="mw:WikiLink" title="Ontario">Ontario</a> from <a href="./Montreal" id="mwCzM" rel="mw:WikiLink" title="Montreal">Montreal</a> to  <a href="./Lake_Nipissing" id="mwCzQ" rel="mw:WikiLink" title="Lake Nipissing">Lake Nipissing</a>, a depression formed by ancient faults, is a failed arm of the ancestor of the Atlantic Ocean?