Detailed Explanation:

Answer: Option 4 — Water reservoirs

The common feature among Aliyar, Isapur, and Kangsabati is that they are all locations of significant water reservoirs in India. Aliyar Reservoir is located in Tamil Nadu, Isapur Dam is an irrigation project in Maharashtra, and Kangsabati Dam is situated on the Kangsabati River in West Bengal. All three serve as important water storage and irrigation infrastructure.

📝 Short Notes: Major Reservoirs in India

• Aliyar Reservoir: Located in Aliyar village, Pollachi taluk, Coimbatore district, Tamil Nadu. Created by the Aliyar Dam on the Aliyar River.
• Isapur Dam: An irrigation project located in Maharashtra, designed to support agricultural activities in the region.
• Kangsabati Reservoir: Located in West Bengal, created by the Kangsabati Dam (also known as Kumari Dam) on the Kangsabati River, primarily for irrigation and drinking water supply.
• Purpose: These reservoirs serve multiple purposes including irrigation, drinking water supply, flood control, and sometimes hydroelectric power generation.
• Importance: Such water infrastructure is critical for agricultural productivity, water security, and regional development in India.