Aliyar dam is located about 24 km from Pollachi along Pollachi – Valparai road. It was innagurated by former Indian Prime Minister Jawaharlal Nehru in 1961 and was constructed between 1958 – 1968 as a part of the Parambikulam-Aliyar Project (PAP). This dam receives water from upper aliyar reservoir through hydro-electric power station in Navamalai and from Parambikulam dam through a contour canal. Aliyar is surrounded by hills on three sides and has got a park and boating facility. Opposite to the dam’s entrance, an aquarium is being maintained by Tamilnadu Fisheries Corporation. From the top of the dam, one can have a spectacular view of coconut trees stretching several km wide. The catchment area of the dam is 121 sq. km and it slightly resembles Indian map when viewed from hair pin bend no. 9, which is about 15 km uphill en route to Valparai.
- Height of the dam: 81 m
- Length of the dam: 316 m
Starting from 1964′s Kadhalikka Neramillai, over hundreds of tamil, malayalam, telugu and hindi movies have been pictured at this location, including tamil blockbusters like Chinna Thambi (1991), Amaithipadai (1994), Kaadhalukku Mariyadhai (1997), Suryavamsam (1998), etc.