人類が初めて船で海を渡ったのはいつごろ
Over thousands of years of human migrations and the rise of ancient civilizations, seafaring exploration led to ocean trade routes. The earliest known reference to an organization devoted to ships in ancient India is to the Mauryan Empire from the 4th century BC. It is believed that navigation as a science originated on the Indus river some 5000 years ago.
4th century BC