Spil Mountain (Turkish: Spil Dağı), is a mountain located in the Manisa Province of western Turkey. The summit of Spil Mountain is 1,509 m (4,951 ft) above sea level. The mountain is composed of limestone and is covered with a dense forest of oak, beech, and pine trees. The mountain is home to a variety of wildlife, including bears, wolves, deer, and wild boar. Spil Mountain is a popular destination for hiking, camping, and picnicking.

1. Location and Geology: Spil Mountain is situated approximately 30 kilometers northeast of the city of Manisa. It is part of the larger Menderes Massif, a mountain range extending across western Turkey. The mountain is characterized by its diverse geological formations, including limestone, marble, and volcanic rocks.

2. Natural Beauty: Spil Mountain is known for its picturesque landscapes and natural beauty. It features lush forests, meadows, and diverse flora and fauna. The mountain offers opportunities for hiking, trekking, and nature exploration, with several trails and viewpoints available for visitors.

3. Spil National Park: A significant portion of Spil Mountain is protected as Spil National Park (Spil Milli Parkı). Established in 1969, the park spans an area of around 62,000 hectares and encompasses the mountain and its surrounding areas. It is an important conservation area, home to various plant and animal species.

4. Historical and Cultural Significance: Spil Mountain has historical and cultural importance dating back centuries. In ancient times, the mountain was associated with the mythological figure Tantalus and the Kingdom of Lydia. It was also a place of worship for the ancient Greeks and Romans. Ruins of ancient cities, such as Nysa and Hypaepa, can be found in the vicinity.

5. Thermal Springs: Spil Mountain is renowned for its thermal springs, which are believed to have therapeutic properties. The area has several hot springs and thermal facilities where visitors can enjoy relaxing baths and spa treatments.

6. Mountaineering and Outdoor Activities: Spil Mountain attracts mountaineers, climbers, and outdoor enthusiasts due to its challenging terrain and scenic routes. It offers opportunities for rock climbing, paragliding, and camping.

When visiting Spil Mountain or its surroundings, it's advisable to check with local authorities or tourism information centers for up-to-date information on access, safety guidelines, and any permits that may be required.