Located in the original Gulang Park west of the Gulangyu Ferry Wharf, the Xiamen Underwater World is one of the largest aquariums with the most characteristics in China, setting two world's records and 10 national records. The Xiamen Underwater World, looks like a Crystal Palace in blue color. It covers an area of 175,000 square meters, and its floorage area totals 7,500 square meters. The Crystal Palace is home to over 10,000 rare aquatic animals from all over the world, which fall into over 350 species, such as sea otters and rays of Australia, river sturgeons from the Mississippi of the United States, penguins of Peru, Julong fish from the Amazon, Chinese sturgeons from the Yangtze River, rock fish and sea horses from the South China Sea, octopuses from the East China Sea, and various kinds of coral reef fish, which will make visitors gasp in admiration.

The Ocean World also includes the Sea Hall, Specimen Hall of Sperm Whales, Penguin Hall, Fresh Water Fish Hall, and Dolphin and Sea Lion Performance Hall. Walking along the submarine tunnel, 80 meters long and 1.5 meters wide, tourists can take a tour of the wonderful and mysterious seabed world together with numerous fish, and go close to see how fish catches food.