About Silent Valley National Park :
Located 40 km from Mannarkkad, Silent valley is Extremely fragile, a unique preserve of tropical evergreen rain forests lying above the equator and the forest strip which causes the summer rains in Kerala.The Silent Valley National Park has an area of 90 sq km is located in the north eastern corner of the district. It rises abruptly to the Nilgiri Plateau in the north and overlooks the plains of Mannarkkad in the south.Silent Valley has a very eventful history in comparison to the other wildlife parks in the country. The local name for the park is Sairandhrivanam (the forest in the valley) and had been a centre of hot debates and protests in the decades of the 70's and 80's of the 20th century. The history of the park goes way back to 1888 when the region was declared a reserved land under the Forest Act and later notified as a Reserved Forest by the Government of Madras in 1914. The Silent Valley National Park is a heavy rainfall region with the places in the higher altitudes getting the highest rain. The average rainfall in the region varies between 2800 and 3400 mm. The park receives most of its rainfall during the southwest monsoon from June to December.