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A lagoon is a shallae bouk o watter separatit frae a lairger body o watter bi barrier islands or reefs. Lagoons are commonly dividit intae coastal lagoons an atoll lagoons. Thay hae an aa been identified as occurrin on mixed-sand an graivel coastlines. Thare is an owerlap atween bodies o watter clessifee'd as coastal lagoons an bodies o watter clessifee'd as estuaries. Lagoons are common coastal featurs aroond the warld.