The Idukki Dam is a double curvature arch dam constructed across the Periyar River in a narrow gorge between two granite hills Kuravan and Kurathi in Kerala, India. Idukki Arch dam, the first of its kind in India as this is the world's second and Asia's first arch dam. This dam was constructed along with two other dams at Cheruthoni and Kulamavu. Together, the three dams have created an artificial lake. Idukki Dam is 554 feet tall. The stored water is used to produce electricity at the Moolamattom Power house, which is located inside nearby rocky caves. The Government of Canada aided in the building of the dam with long term loans and grants. Travelers allowed to visit the dam only two times in a year, one is in Christmas New year season and another one is in Onam season.