Some borders are internationally recognized while others are not accepted by all countries. The borders with Lebanon, Syria and Jordan are based on those drawn by the United Kingdom and France in 1923. The border with Egypt is the international border determined in 1906 between United Kingdom and the Ottoman Empire. Israel's borders with Egypt and Jordan have been formally recognized as part official peace treaties between the countries. On the other hand, the borders with Syria and Palestinian National Authority are still in dispute between the sides involved. The Golan Heights area is at the heart of the dispute between Israel and Syria on their common border. There is agreement between Israel and Lebanon on their border, with the exception of a small area of known as the "Shebaa Farms" which Israel took over during a war. Since the 1990s, Israel and the Palestinian Authority have been negotiating a border between them as well.