The Blue Mountains is a mountainous region located in New South Wales, Australia, just west of Sydney. It is known for its stunning natural beauty, featuring deep valleys, rugged cliffs, and dense eucalyptus forests. The area is part of the Greater Blue Mountains World Heritage Area, recognized for its unique biodiversity and significant geological formations. Visitors to the Blue Mountains can enjoy various outdoor activities, including hiking, rock climbing, and sightseeing. Popular attractions include the Three Sisters, a famous rock formation, and the scenic Blue Mountains National Park, which offers numerous walking trails and breathtaking views of the surrounding landscape.