Abstract : Since 1948, the Middle Eastern conflict is an important issue in international relationships and Law. During that year, the British mandate on Palestine collapsed and the State of Israel was created. But, yet, at the beginning, a war between Sionists, Arabic countries, and Palestinians fixes « borders » between Israel and its Arab neighbours. Moreover, in 1967, a new issue appears, the relationships with the Occupied Territories. Consequently, Israel has two questions about its borders to manage : the classical question of borders between States and an internal question with the Palestinians about a new State. This research tries to demonstrate the ways used by local and international partners to find a solution to this legal question, cause of the local instability and widely. This work is founded on Law, History, Political Science (particularly, the study of Arabist and Sionist ideologies during the XXth century) and international relationships. All these elements will permit us to find a coherence about failures and successes since 1948 in the story of the Middle East and the fact that the State of Israel has only two borders internationally recognized with Jordan and Egypt, more than 50 years after its birth.