The Syrians penetrated an area held by the State of Israel, but they did not cross the Israeli border. Nor did Palestinians from the Gaza Strip attempt to cross the Israeli border in the south.
By Gideon Biger; The writer teaches in the geography department of Tel Aviv University.
On Sunday, May 15, which the Arabs call Nakba Day, the media reported that Syrian civilians had crossed over the Israeli border on the Golan Heights. The prime minister even issued a dramatic announcement of the fact and promising that Israel will protect its borders.
The incident raises the question of whether Israel has a border with Syria on the Golan Heights. The answer seems obvious, but in fact it is not. An international border is one reached by agreement between the two political entities on either side. Sometimes the line is the result of direct negotiations, but not always. Europe's post-World War II borders were drawn by the victors, while in the 19th century Africa was divided up by and among the great powers of Europe. Some of the states whose borders were drawn in that manner protested their location, but in the end they accepted the demarcation and it became an international border.
There are still some localized conflicts over the precise delimitation of borders still occur. Recent examples include those in Central America, between Nicaragua and Costa Rica; and in Southeast Asia, between Cambodia and Thailand. In both cases the argument is over the precise location of the border, not its very existence.
Israel is an atypical state in that it does not have agreed international borders with all of its neighbors. That is especially true in the case of Lebanon and Syria. Israel and Lebanon are currently separated by the so-called Line of Withdrawal of Israeli Forces from Lebanon, agreed in 2000 between Israel and the United Nations and also known as the Blue Line. It corresponds in part with the international border demarcated by the English and French governments in 1923. In practice, there is currently no border between Israel and Lebanon.
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http://www.haaretz.com/print-edition/opinion/they-crossed-no-borders-1.362215