Explanations:The Idukki Dam is a significant hydroelectric dam located in the Idukki district of Kerala, India. It is one of the largest arch dams in Asia and is a crucial source of hydroelectric power for the state. The dam is built across the Periyar River, which is one of the major rivers in Kerala.
The Periyar River originates in the Western Ghats and flows through the districts of Idukki and Ernakulam before draining into the Laccadive Sea. The construction of the Idukki Dam was completed in 1975, and it has since played a vital role in the power generation and water management of the region. The dam is part of a larger hydroelectric project that includes the Cheruthoni and Kulamavu dams, which together form the Idukki Arch Dam complex.
Understanding the geographical context of the Idukki Dam is essential for students studying the geography of Kerala and the broader region of southern India. The Periyar River is a significant waterway in Kerala, and its role in the construction of the Idukki Dam highlights the importance of river systems in the development of hydroelectric power infrastructure.
It is important to note that the Idukki Dam is not associated with other major rivers in India, such as the Narmada or Krishna rivers, which are located in different parts of the country. The Narmada River flows through central India, primarily in the states of Madhya Pradesh and Gujarat, while the Krishna River is located in southern India, primarily in the states of Karnataka, Telangana, and Andhra Pradesh. These rivers are associated with their own hydroelectric projects and are not related to the Idukki Dam.
Therefore, the correct answer is that the Idukki Dam is built across the Periyar River, which is a significant river in Kerala and a crucial component of the region's hydroelectric power infrastructure.