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Silent Valley is a pristine natural sanctuary in the Nilgiri Hills of Kerala, India, with diverse ecosystems and endemic species. Learn about its history, wildlife, attractions, and conservation efforts in this comprehensive guide. Here's everything you need to know about the beautiful Silent Valley National Park in Kerala to plan your trip: best time, how to reach, hotels, budget, and more. All about Silent Valley in Kerala. Wildlife, trekking trails, cultural experiences, timings, how to reach, and the best time to visit. Start planning your adventure today! Silent Valley was declared as National Park in 1984 and formally inaugurated in the year 1985. Initially there was only 89.52 sq.km. area under the Division which forms the core zone of the National Park.