Their geological formation is metamorphic gneiss, veined with felspar and quartz, and interspersed with reddish porphyrite. Twelve Major forest types are found in the area which are now fragmented by many coffee and tea plantations on the lower slopes and teak plantations higher up. Monsoon rains are heavy. Annual rainfall varies from 2,000 mm to 5,000 mm in the area.
The Anamala / Anaimalai Hills are a trekking destination in the Western Ghats. The best time to visit this place is during November to mid-May. SH-17 passes through the Anamala / Anaimalai Hills, between Udumalapet and Munnar. The nearest town is Munnar. The nearest International Airport is in Cochin and Coimbatore.
^Singh, A.P.; Kumar, Niraj; Singh, B. (2006). "Nature of the crust along Kuppam–Palani geotransect (South India) from Gravity studies: Implications for Precambrian continental collision and delamination". Gondwana Research10: 41–7. doi:10.1016/j.gr.2005.11.013.
^Fabricius, Johann Philipp. (1972) J. P. Fabricius's Tamil and English dictionary, 4th ed., rev. and enl. Tranquebar: Evangelical Lutheran Mission Pub. House, retrieved 6/18/2007 anai (āṉai), an elephant
^Sajeev T.K. et al., Management of Forests in India for Biological Diversity and Forest Productivity- A New Perspective, WII-USDA Forest Service Collaborative Project Grant No. FG-In-780 (In-FS-120), Volume III (ACA) Anaimalai Conservation Area.
^Singh, M; Singh, M; Kumar, MA; Kumara, HN; Sharma, AK; Kaumanns, W (2002). "Distribution, population structure, and conservation of lion-tailed macaques (Macaca silenus) in the Anamala / Anaimalai Hills, Western Ghats, India". American journal of primatology57 (2): 91–102. doi:10.1002/ajp.10037. PMID12111684.