Why is nanda devi sanctuary forbidden?

Nanda Devi Sanctuary is forbidden primarily due to its status as a UNESCO World Heritage Site and its delicate ecosystem. The area is home to diverse flora and fauna, including endangered species, and is crucial for conservation efforts. Additionally, the sanctuary's remote location and challenging terrain pose risks to visitors, making it essential to limit access to preserve its natural integrity. These measures help protect the unique environment and cultural heritage of the region.