International Mountain Day is celebrated on December 11 each year to raise awareness about the importance of mountains and the challenges they face. Established by the United Nations in 2003, this day highlights the vital role mountains play in providing fresh water, biodiversity, and climate regulation. The observance encourages sustainable development in mountainous regions and promotes the conservation of their unique ecosystems. Activities on this day often include educational events, community gatherings, and initiatives aimed at protecting mountain environments and supporting the livelihoods of those who depend on them, such as mountain communities and indigenous peoples.