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.
Namun, perjalanan lewat laut berbahaya ​ — khususnya selama musim monsun, sewaktu sungai - sungai juga tidak dapat dilayari ​ — dan rute - rute jalan serta rel kereta api menembus jauh ke daerah pedalaman guna menghindari banyak perintang alami.