산신, or "Mountain Spirit," is a deity in Korean folklore that represents the spirit of mountains. Often depicted as a wise old man, 산신 is believed to protect the natural environment and the people living near mountains. He is associated with fertility, prosperity, and good fortune, making him an important figure in traditional Korean beliefs. In many regions of Korea, people hold rituals and ceremonies to honor 산신, especially during the harvest season. These practices reflect the deep connection between the community and nature, emphasizing the importance of mountains in Korean culture. The worship of 산신 is part of the broader belief system that includes other deities and spirits, such as 토지신 (Earth Spirit) and 신령 (Shamanic Spirits).