Gregory Rift
... that the Gregory Rift in East Africa contains the world's only active carbonatite volcano, Ol Doinyo Lengai ?
... that the <b id="mwDhM"><a href="./Gregory_Rift" id="mwDhQ" rel="mw:WikiLink" title="Gregory Rift">Gregory Rift</a></b> in East Africa contains the world's only active <a href="./Carbonatite" id="mwDhU" rel="mw:WikiLink" title="Carbonatite">carbonatite</a> volcano, <a href="./Ol_Doinyo_Lengai" id="mwDhY" rel="mw:WikiLink" title="Ol Doinyo Lengai">Ol Doinyo Lengai</a> <i id="mwDhc">(pictured)</i>?