Sanjay Gandhi National Park (SGNP), previously called Borivali National Park, is a large protected area in the northern part of Mumbai city (preferably called Mumbai Suburban district) in Maharashtra State in India. It encompasses an area of 104 km2 (40 sq mi) and is surrounded on three sides by India's most populous city.It is notable as one of the major national parks existing within a metropolis limit and is one of the most visited parks in the world.