The <a href="https://en.wikipedia.org/wiki/International_Opium_Convention" id="mwtw" rel="mw:WikiLink" title="International Opium Convention">International Opium Convention</a> is signed at <a href="https://en.wikipedia.org/wiki/The_Hague" id="mwuA" rel="mw:WikiLink" title="The Hague">The Hague</a>.