In the light of these preliminaries, now let us see the importance of Pundranagara i.e.
Mahasthan as a historic city and an emporium of inland trade in the history of North
Bengal. Pundranagara which is considered as a metropolitan city of North Bengal in
ancient and medieval times stands on the western bank of the river Karatoya. This river
has now been reduced to an insignificant stream, even in some places it has silted up. But
in the thirteenth century A.D., as stated by Minhaj Siraj, it was as wide as three times of
the Ganges.
This river, as it seems, springing from the Himalayan mountain on the
furthest north of the Bhutan border passed through the districts of Darjeeling and
Jalpaiguri, and touching the districts of Dinajpur, Rangpur, Bogra and Pabna it fell in to
the Ganges i.e. Padma as shown in the map of Von Den Brooke.
Passing through the
various channels and under the different names, the Karatoya threw her water in the Bay
of Bengal and established her connection with the sea port of Chittagong. In the Karatoya
Mahatmya it is stated that from quite ancient time in the Push Narayanijug, the people of
Hindu extraction used to come to have bath for the purification of their sins in the bank of
Karatoya where now Mahasthan stands.
ix[9]
In the Periplus of the Erythraen sea of about
the first century A.D. and the Geography of Plotemy of about the second century A.D.
there comes a reference to the province of 'Kirada’.
This is possibly the places on
either side of the river Karatoya as it is presumed that 'kirada' is a Greek version of the
river Karatoya. On the basis of this presumption the river Karatoya can be traced to a
long antiquity. In the seventh century A.D. Hiuen Tsang, the Chinese pilgrim, had to
cross a river ka-lo-tu i.e. Karatoya while reaching Kampura from Pundravardhana".
The river Bagmati
which according to Muslim chronicles was three times larger than
the Ganges and has been identified with the Karatoya flew close by the eastern side of
Mahasthan. The inscriptional and literary sources, if analysed, bear witness to this fact
that the Karatoya had always been a navigable river either carrying the merchandise-ships
or the war flotilla