San Martín de Valdeiglesias is a municipality located in the Community of Madrid, Spain. It is situated in the Sierra de Guadarrama mountain range and is known for its natural beauty, including forests and rivers. The town has a rich history, with several historical buildings and sites, such as the Castle of San Martín. The area is popular for outdoor activities, including hiking and water sports, thanks to the nearby San Juan Reservoir. The local economy is supported by agriculture, tourism, and small businesses. San Martín de Valdeiglesias also hosts various cultural events throughout the year, attracting visitors from nearby regions.