"There is hardly any specific geographical information in the TS. The Satapatha Brahmana (SB)is richer from this point of view (Eggeling 1882-1900, Parts 1-4). Its most famous passage (1.4.1.14-16) describes the journey of fire to the Sadanira or Gandak of modern north Bihar: Mathava, the Videgha, was at that time on the (river) Sarasvati. He (Agni) thence went burning along this earth towards the east, and Gotama Rahugana and the Vigha Mathava followed after him as he was burning along. He burnt over (dried up) all these rivers. Now that (river) which is called Sadanira flows from the northern (Himalaya) mountain: that did not burn over. That one the Brahmans did not cross in former times, thinking it has not been burnt over by Agni Vaisvanara. Nowadays, however, there are many Brahmanas to the east of it. At that time it (the land east of the Sadanira) was very uncultivated, very marshy, because it had not been tasted by Agni Vaisvanara. Nowadays, however, it is very cultivated, for the Brahmans have caused (Agni) to taste it through."