I guess the Pacific Ocean evaporates the most water because of its size.
But which of the major oceans evaporates the most water per square meter?
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When push comes to shove, the highest evaporation rate per unut area corresponds to the highest average temperature. As this pair of illustrations from NASA shows, that would be the Indian Ocean.
Simply put, the Indian Ocean misses both polar regions and hits the tropical and subtropical latitudes squarely, so it is warmer overall. Ergo more evaporation.