How big is the Lago Mar crystal clear lagoon? The Lago Mar crystal clear lagoon is 12 acres. It is the largest in Texas and the first to offer public access. WDD Content2022-05-24T14:09:34-05:00May 24, 2022|Categories: Technology| Share This Story, Choose Your Platform! FacebookXRedditLinkedInWhatsAppTelegramTumblrPinterestEmail