alpine and upper temperate zones. Trekking and tourism In the recent years, the GHNP has emerged as a popular trekking and ecotourism destination. The GHNP office at Sai Ropa issues permits for the treks. There are several popular trekking routes in the park, ranging from those that can be done in a day or two, to those that can take up from a week to ten days. Ecotourism and homestay tourism has also being gaining popularity in places outside but near to the park. See also Pandey, Sanjeeva and Tony Gaston. 2019. Great Himalayan National Park: The Struggle to Save the Western Himalayas. New Delhi: Niyogi Books. https://www.greathimalayannationalpark.org/ References Geography of Kullu district National parks in Himachal Pradesh Protected areas established in 1984 World Heritage Sites in India 1984 establishments in Himachal Pradesh Western Himalayan subalpine conifer forests