Bhoothathankettu is a dam and tourist spot in Kerala, India. It is situated outside the village of Pindimana, about 10 km away from the town of Kothamangalam and 50 km away from the main city of Kochi. The original natural dam has been supplemented by a modern dam impounding the Bhoothathankettu Reservoir (Thattekad Reservoir). During the Malayatoor pilgrim season, travelers use the roads through the forest
Large blocks of unshaped stones are placed on both sides of the Periyar River to form the dam, making it look like a natural dam built by superhumans. The name Bhoothathan Kettu, means "monster fort"; past generations believed it was built by a Bhootham (monster).
The reason behind the dam's name is that monsters(Malayalam: Bhootham) planned to submerge the Trikkariyoor temple, whose presiding deity is Lord Shiva by making a dam in the Periyar river and flooding the area. Suspecting trickery the omnipotent Lord Shiva, came up with a plan to deter them. He faked the
approaching dawn by a rooster's sound. The demons fearing the arrival of light fled the place. To this day there is a visible proof of their effort where you can see the boulders which the demons were supposed to have rolled onto the riverbed, the Old Bhothathankettu. The Periyar flows on through the narrow space which the demons did not quite manage to dam up.
It has been attributed to two great floods – one in the 4th century and the other in 1341, which threw open the port of Kochi. The massive landslides during the flood are believed to have caused gigantic rocks to roll down from the mountain and become entrenched in the Old Bhoothathankettu.
Tippu's Lost Later in April 1790 Tipu decided to capture Travancorea and was able to break into the territory after making the way through the Nedumkotta. He destroyed the wall at Konoor kotaa or kottamuri and advanced further. He filled trenches for a few kilometres to enable his army to move forward.He destroyed many temples and churches and brought enormous harm to the people. He finally reached the Periyar river banks at Aluva and camped there. However, by this time a small group led by Vaikom Padmanabha Pillai and Kunjai Kutty Pillai went upstream and managed to break the walls of a dam at Bhoothathankettu causing heavy flash floods downstream Periyar river.