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Plaza Sur is among the best snorkeling destinations in the worldPlaza Sur South Plaza — is one of the smallest yet richest islands in the archipelago, known for its rich marine life, according to Galapagos Travels. The abundant and friendly sea lions, the largest animals on the islands (with adult males weighing up to 550 pounds) are one of the main reasons snorkelers go there. Covering the seabed you’ll also find damselfish, triggerfish, hogfish, sea stars, and urchins.