The Sierra de San Juan is a mountain range located in the central region of Mexico. It is part of the larger Sierra Madre Oriental and is known for its diverse ecosystems, including forests and grasslands. The area is home to various wildlife species and offers opportunities for outdoor activities such as hiking and birdwatching. The range is also significant for its geological features, including limestone formations and unique rock structures. The Sierra de San Juan plays a crucial role in the local climate and hydrology, influencing weather patterns and water sources for nearby communities.