Mousa Ler is a mountainous region in the Hatay province of Turkey, located near the Mediterranean Sea. The region is historically significant for the events that took place during the Armenian Genocide.

In 1915, during the First World War, the Ottoman Empire, which was controlled by the Young Turks, began a campaign of ethnic cleansing against its Armenian citizens. As part of this campaign, Armenian villages and towns were attacked, and many Armenians were forcibly deported or killed. However, in Mousa Ler, a group of several thousand Armenians, including men, women, and children, refused to submit to deportation and instead chose to resist the Ottoman forces.

The Armenians of Mousa Ler built barricades and dug trenches to defend themselves against the Ottoman soldiers. The resistance lasted for 53 days, during which time the Armenians were able to hold off the Ottoman forces and attract the attention of the outside world. Eventually, the French Navy arrived and evacuated the Armenians, taking them to safety in Egypt.

The resistance at Mousa Ler became a symbol of Armenian resistance against Ottoman oppression and a source of inspiration for the Armenian independence movement. The events at Mousa Ler were later depicted in the novel "The Forty Days of Mousa Ler" by Franz Werfel, which brought international attention to the Armenian Genocide. Today, Mousa Ler remains an important site for Armenian commemoration and remembrance