The Treaty of Lausanne was a peace treaty signed in 1923 in Switzerland's city Lausanne, after Turkey had won the Greco-Turkish War in 1919 to 1922. It settles the border between Greece and Turkey and the other borders of Turkey. Other countries that signed the treaty were Italy, France, the United Kingdom, Japan and Yugoslavia.
Greece and Turkey still have disputes that are often focused on the question over the country that owns islands and rocks, most of which are uninhabited, in the Aegean Sea. In 1987 and 1996, those disputes almost led to military conflict.