Lake Amara
... that the sapropelic mud from Lake Amara contains around 40% organic and 41% mineral substances?
... that the <a href="./Sapropel" id="mwEVU" rel="mw:WikiLink" title="Sapropel">sapropelic mud</a> from <b id="mwEVY"><a class="mw-redirect" href="./Lake_Amara_(Ialomiţa_County)" id="mwEVc" rel="mw:WikiLink" title="Lake Amara (Ialomiţa County)">Lake Amara</a></b> contains around 40% organic and 41% mineral substances?