The <a href="https://en.wikipedia.org/wiki/Montreux_Convention_Regarding_the_Regime_of_the_Straits" id="mw2g" rel="mw:WikiLink" title="Montreux Convention Regarding the Regime of the Straits">Montreux Convention</a> is signed in <a href="https://en.wikipedia.org/wiki/Montreux" id="mw2w" rel="mw:WikiLink" title="Montreux">Switzerland</a>, authorizing <a href="https://en.wikipedia.org/wiki/Turkey" id="mw3A" rel="mw:WikiLink" title="Turkey">Turkey</a> to fortify the <a href="https://en.wikipedia.org/wiki/Dardanelles" id="mw3Q" rel="mw:WikiLink" title="Dardanelles">Dardanelles</a> and <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Bosphorus" id="mw3g" rel="mw:WikiLink" title="Bosphorus">Bosphorus</a> but guaranteeing free passage to ships of all nations in peacetime.