Sperrgebiet
... that the Sperrgebiet, a diamond mining area closed to the public, makes up 3 percent of Namibia's surface area?
... that the <b id="mwAkI"><a class="mw-redirect" href="./Sperrgebiet" id="mwAkM" rel="mw:WikiLink" title="Sperrgebiet">Sperrgebiet</a></b>, a <a class="mw-redirect" href="./Diamond_mining" id="mwAkQ" rel="mw:WikiLink" title="Diamond mining">diamond mining</a> area closed to the public, makes up 3 percent of <a href="./Namibia" id="mwAkU" rel="mw:WikiLink" title="Namibia">Namibia</a>'s surface area?