Kaziranga National Park (Assamese: কাজিরঙা রাষ্ট্রীয় উদ্যান, IAST: kājirangā jātiya uddyāna, [kaziɹɔŋa ɹastɹijɔ udːjan] ) is an Indian national park and a World Heritage Site in Golaghat and Nagaon districts of Assam, India. It is refuge for the world's largest population of great one-horned rhinoceros. Kaziranga has the highest density of tigers among protected areas in the world and was declared a Tiger Reserve in 2006. The park has large breeding populations of elephant, wild Asiatic water buffalo and swamp deer. Kaziranga is recognized as an Important Bird Area by Birdlife International for conservation of avifaunal species. The park has achieved notable progress in wildlife conservation with respect to other protected areas in India.