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In page Lethe:

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In Cádiz, Spain, the river Guadalete was originally named "Lethe" by local Greek and Phoenician colonists who, about to go to war, solved instead their differences by diplomacy and named the river Lethe to forever forget their former differences. When the Arabs conquered the region much later, their name for the river became Guadalete from the Arabic phrase وادي لكة (Wadi lakath) meaning "River of Forgetfulness".[citation needed]