Explanations:The Idukki dam is a notable hydroelectric dam located in the Idukki district of Kerala, India. It is constructed across the Periyar River, which is one of the major rivers in the state. The Periyar River originates from the Anamudi peak in the Western Ghats and flows through the Idukki district before joining the Arabian Sea. The Idukki dam is a part of the Idukki arch dam complex, which includes three dams: the Idukki, the Cheruthoni, and the Kulamavu.
The construction of the Idukki dam was completed in 1975, and it is known for its unique design. The dam is an arch dam, which means it is curved in a way that allows it to withstand the pressure of the water behind it. The dam is not only a significant source of hydroelectric power for the region but also serves as a major tourist attraction due to its impressive engineering and scenic location.
Understanding the geographical context of the Idukki dam is crucial for students preparing for competitive examinations, particularly those related to geography and general knowledge. The Periyar River is a key feature of the region, and its association with the Idukki dam highlights the importance of river systems in the development of hydroelectric power projects in India.
It is important to note that while the Periyar River is the correct answer, other rivers in Kerala, such as the Pamba, Meenachil, and Bharathapuzha, are also significant in their own right. Each of these rivers has its own unique characteristics and plays a vital role in the geography and economy of the state. However, for the specific context of the Idukki dam, the Periyar River is the correct river on which the dam is constructed.