Why is the edge of Ganga so special?

Why is the edge of trending Ganges so special? In the ‘History of Indus Valley Civilization’, Purushottam Shriram Sadar writes that the Indus Valley Civilization was mainly located on the banks of the Indus River, but it expanded to the upper regions of the Ganges. In the fourth century BC, Emperor Ashoka’s empire began to settle on the banks of the Ganges. He was the one who cut the construction of Buddhist stupas in Bodh Gaya and Kashi next to the Ganges. In the Ganges: The River of Sanatan Civilization “Defle Mishra writes that 4 Mahajanapadpads were established on the banks of the Ganges during the sixth century BC.