However they got up to the Himalayas, they're there. There's also a species in the Ganges River in neighboring India (and a Ganges shark). There is even a freshwater dolphin species in the Americas, in the greatest body of fresh water on Earth, the Amazon River.
This is a report on the healing power and compassion of the Brazilian pink river species. Sadly, natives in each of these countries either have fear-based superstitions or greed that provokes them to slaughter these mammals to the verge of extinction. This is in spite of the fact that one never hears of dolphins harming humans but only the contrary: Dolphins help humans, saving lives when we are drowning or lost or suffering illness (as in this video). They are like dogs to humankind, without having had their wild nature selected out. They are like "Man's best friend," Fido, the domesticated-wolf.
"The Cove" documentary LA Times review