Deir El Aachayer is a territory of Syria
The Mandate for Syria and Lebanon first officially defined the border line between Lebanon and Syria after the end of World War I (WWI), when the Ottoman Empire was dissolved. France controlled this general area until 1943, when Lebanon and Syria declared their independence. Later, in 1976, Syria began a military occupation of Lebanon when Lebanon experienced political turmoil due to its civil war. This occupation continued until 2005, although the border was not officially defined at that time. In fact, some territories between these two countries remain under dispute today. One example of this dispute is the town of Deir El Aachayer. Although largely accepted as territory of Lebanon, the Syrian government continues to lay claim to this area.