Three national parks protect portions of the Nilgiris. Mudumalai National Park lies in the northern part of the range where Kerala, Karnataka, and Tamil Nadu meet, and covers an area of 321 km2. Mukurthi National Park lies in the southwest of the range, in Kerala, and covers an area of 78.5 km2, which includes intact "shola"-grassland mosaic, a habitat for the Nilgiri tahr. Silent Valley National Park is just to the south and contiguous with these two parks, and covers an area of 89.52 km2. Outside these parks much of the native forest has been cleared for grazing cattle, or has been encroached upon or replaced by plantations of tea, eucalyptus, cinchona and acacia. The entire range, together with portions of the Western Ghats to the northwest and southwest, was included in the Nilgiri Biosphere Reserve in 1986, India's first biosphere reserve. In January 2010, the Nilgiri Declaration set out a wide range environmental and sustainable development goals to be reached by 2015.