But sea travel was hazardous ​ — especially during the monsoon season, when rivers were also unnavigable — ​ and road and rail routes went way inland to circumvent many natural obstacles.
अनेक शतकांपासून किनारपट्टीवरील बंदरे, भारताअंतर्गत आणि परदेशांसोबतचा येथून होणारा व्यापार हाताळत होते.