The exact origin of the word "Bangla" is unknown, though it is believed to come from "Vanga", an ancient kingdom and geopolitical division on the Ganges delta in the Indian subcontinent. It was located in southern Bengal, with the core region including present-day southwestern Bangladesh and southern West Bengal (India). In Abrahamic tradition, it is said to have come from "Bung/Bang", a son of Hind (the son of Hām, who was a son of Noah) who colonised the area for the first time. The suffix ""al"" came to be added to it from the fact that the ancient rajas of this land raised mounds of earth 10 feet high and 20 in breadth in lowlands at the foot of the hills which were called "al". From this suffix added to the Bung, the name Bengal arose and gained currency". Support for this view is found in Ghulam Husain Salim's "Riyaz-us-Salatin".