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Hafa Adai and welcome to the marine world of Guam, USA. Guam has the richest coral reef marine environment of any United States territory or state. Thriving with more than 1,000 fish species and over 400 kinds of corals and a diverse set of marine invertebrates. In short, Guam has what divers want through its offering of superb Pacific coral reef biodiversity.

But the submerged natural marvels are complimented by much more. Guam also has a rich historic past that includes shipwrecks and submerged remnants from the wars of WWII and WWI. There are even sites from the far past of the early trading days of Spain’s gold-bearing Manila Galleons.

Guam’s beautiful topside landscape extends into the sea. Volcanic in the south and limestone forest in the north, this unique geologic combination gives divers steep, dramatic dropoffs, coral gardens, sloping reefs and Cocos Island, a barrier reef island in the south (above).

The coastal areas are pocked with protected bays and coves that are great for snorkelers. Guam now has a series of marine preserves that can be easily accessed from shore for easy snorkeling.

The north provides limestone caves and swim-throughs.

And, Guam’s water is consistently warm and clear. Divers, snorkelers and beach lovers can enjoy Guam’s marine world throughout the year.

Read more about Guam's great diving and snorkeling in this free e-book from GVB.