|Technology required||Map Making|
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Cities with a Harbor produce veteran naval units instead of regulars. Coastal, sea, and ocean squares produce one extra food. A harbor is a link in the trade network, allowing luxuries and strategic resources to be traded to other harbors.
Just because a city is built in a coastal region doesn't guarantee that the city is readily accessible by ship. In order for a port city to establish a steady trade, fishing, or other shipping industry, the city must have a harbor. A harbor is a protected body of water that opens into an ocean or lake that shelters ships from waves and high winds. Although some coastal cities are established in areas where a natural harbor exists, most seaports are forced either to improve the existing natural harbor, or to build a man-made harbor to shelter ships and provide channels deep enough to accommodate large vessels.