https://en.wikipedia.org/wiki/Indian_maritime_history
Indologists hold a view that the Rann of Kutch was, rather than the salt marsh that it is today, a navigable archipelago at the time of the Indus Civilization. The Indus Civilization was known to have an extensive maritime trade system, so there were perhaps ports in the Rann of Kutch.[13]
There is an elaborate description of the Rann of Kachchh in the Periplus of the Erythraean Sea 4 , which states 'Beyond the river Sinthus there is another gulf, not navigable, running in towards the north; it is called Eirinon; its parts are called separately, the small gulf and the great; in both parts the water is shallow, with shifting sandbanks occurring continually and a great way from shore; so that very often when the shore is not even in sight, ships run aground, and if they attempt to hold their course they are wrecked'
https://en.wikipedia.org/wiki/Chola_invasion_of_Srivijaya
https://www.distinctdestinations.in/blog/india/exploring-india-s-maritime-silk-trade-route
https://www.moneycontrol.com/company-facts/southindiashippingcorporation/history/SIS
https://en.wikipedia.org/wiki/Shipping_Corporation_of_India
https://www.marineinsight.com/maritime-history/the-history-of-shipbuilding-in-india/
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