The Sierra de Guadarrama is a mountain range located in central Spain, part of the larger Sistema Central. It stretches approximately 80 kilometers and forms a natural border between the provinces of Madrid and Segovia. The range is known for its diverse ecosystems, including forests, alpine meadows, and rocky peaks, making it a popular destination for outdoor activities like hiking and skiing. The highest peak in the Sierra de Guadarrama is Peñalara, which reaches an elevation of 2,428 meters. The area is also home to several protected natural parks, such as the Sierra de Guadarrama National Park, which aims to preserve its unique flora and fauna. This region is rich in cultural history, with ancient trails and historical sites scattered throughout the landscape.