|These passes and
routes played a conspicuous role in shaping the cultural and economic life of Assam, nay
of India. In the first place, they facilitated India's cultural expansion to China and
commercial transactions with Central Asia. Secondly, they helped a good deal the movement
of the population of the Mongoloid blood, who came and settled in Assam. The Ahoms, who
for 600 years and have left a deep, impress on various aspects of her history, came to
Assam as early as the 13th century A.D., from Thailand.
Many big rivers like Kapili cover Assam, Dhansiri, Subansiri, Dikhow,
Pagladia, and others cover Assam. But the most important of them all and the one which
runs through the heart of the State is the river called in Sanskrit the Brahmaputra or Sri
Lauhita. In Assamese it is called Lohit or Luit.