Vamanapuram River is an 88 km (55 mi) long river in southern Kerala. The river originates in the Chemunjimotta hills (alt. 1860m) hills on the southern side of the Western Ghats, and flows through Thiruvananthapuram district of Kerala. It ends in Anjengo Lake (Anchuthengu Lake) near Attingal otherwise known as "Kollampuzhayaru" and "Attingalaru". The two tributaries of this river are the Upper Chittar & Manjaprayar streams.
Kallar, Poovampaarayar, Attingalar Kollampuzhayaru
|Region||Palodu, Vamanapuram, Attingal, Keezhattingal, Kadakkavoor|
|- location||Chemunjimotta hills|
|- elevation||1,860 m (6,100 ft)|
|Anjengo Lake, kadakkavoor|
|Length||88 km (55 mi)|
Attingal municipality is spread along the banks of this river thus it gets the name Attingalar. It is the longest river in Thiruvananthapuram district. Thiruvaaraattukaav Devi temple located at Kollampuzha in Attingal which is historically well known as the temple of the Goddess of Travancore Royal dynasty is situated on the banks of this river.