The Sierra de Alvão is a mountain range located in northern Portugal, specifically within the Alvão Natural Park. It features stunning landscapes, including rugged cliffs, deep valleys, and diverse flora and fauna. The area is popular for outdoor activities such as hiking and birdwatching. The highest peak in the range is Marão, which offers breathtaking views of the surrounding countryside. The Sierra de Alvão is also known for its unique geological formations, including granite outcrops and waterfalls, making it a significant site for both nature lovers and researchers.