How deep is the Lago Mar crystal clear lagoon? The Lago Mar crystal clear lagoon is 10 feet deep at its deepest. The designated swimming areas are 3 feet deep. WDD Content2022-05-24T14:12:17-05:00May 24, 2022|Categories: Technology| Share This Story, Choose Your Platform! FacebookXRedditLinkedInWhatsAppTelegramTumblrPinterestEmail