In India, Indus Dolphin, one of the world's rarest mammals, is mainly found in which one of the following rivers?

The Indus River Dolphin (Platanista gangetica minor) is one of the world's rarest freshwater mammals and is primarily found in the Indus River system of Pakistan and India [1]. In India, its distribution is extremely limited, with a small, isolated population residing in the Beas River in Punjab [1]. This species is distinct from the more common Ganges River Dolphin, which is found in the Ganga and Brahmaputra river systems [1]. The Indus dolphin is an obligate freshwater cetacean that has adapted to live in silty river environments [3]. It is currently listed as Endangered by the IUCN due to threats like habitat fragmentation from barrages and chemical pollution. While the majority of the population exists in Pakistan, the Beas River remains the only known habitat for this species within Indian territory [1].

Sources

1. [1] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 16: Conservation Efforts > 16.13. PROJECT DOLpHIN > p. 245
2. [3] https://www.sciencedirect.com/science/article/abs/pii/S0006320715300999