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.
सदियों से तटीय बंदरगाहों का भारत देश और दूसरे देशों के साथ कारोबार करने में बहुत बड़ा हाथ रहा है ।