Despite the large U.S. military presence on Guam, there is also a sizeable civilian population of Micronesians, Carolinians and Asians. Guam lies at the southern tip of the Marianas Island chain. It is just 30 miles long and 9 miles wide with high volcanic hills in the south. Reefs that feature a wealth of hard corals surround the island both on the west lee side and the more turbulent East Coast, however World War II shipwrecks highlight most dive trips. Reefs are frequently gentle slopes that extend to depths of about 90 feet, and the island's dive variety includes a blue hole experience.
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