Seti Bay Observation Deck Introduction: Seti Bay Observation Deck, you can have a panoramic view from the calm and graceful scenery of Seti Bay to Coco Island Lightning Mountain (Mount Humuyong Manglo). Lightning Mountain is 1.334 feet above sea level and is the highest peak in Guam. If viewed from the bottom of the sea rock, Lightning Mountain can be called the highest peak in the world. It only takes 30 minutes to climb to the top. Looking southward, you will see the winding coastline, which is unique.
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