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In page Zuiderzee:

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Around the Zuiderzee many fishing villages grew up and several developed into walled towns with extensive trade connections, in particular Kampen, a town in Overijssel, and later also towns in Holland such as Amsterdam, Hoorn, and Enkhuizen. These towns traded at first with ports on the Baltic Sea, in England, and in the Hanseatic League, but later also with the rest of the world when the Netherlands established its colonial empire. When that lucrative trade diminished, most of the towns fell back on fishing and some industry until the 20th century when tourism became the major source of income.[citation needed]