Blue Hole (Guam)

The oddity, explained

Why is Blue Hole (Guam) unusual?

Blue Hole (Guam) appears here because the approved source classifies it as natural world. The source describes it as Submarine sinkhole off the west coast of Guam. Heritage Atlas treats that specific classification-and-description combination as the oddity; the score is a comparative discovery signal, not proof of mystery or the supernatural.

Evidence and further exploration

The coordinate, category and description remain tied to the cited source. Comparative oddness helps discovery; it does not add facts that the source does not provide.