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Sailing is a Tier Two technology that allows you to build ports, a costly but specialized building that gives 2 population. Moving a land unit onto a port creates a Boat, which can be upgraded to a Ship for 5 stars.

This also allows Boats and Ships to travel on shallow water.

Sailing is a Tier Two technology, and can only be researched after Fishing is researched. It leads to Navigation.

Ports can also connect roads which are separated by water; two ports on opposite sides of a river will form a grey underwater road connecting them.