Blue Hole (Guam)
A natural limestone shaft in the reef off Orote Point, about 300 ft (90 m) deep, with a mooring and a shallow rim near 12 m. Divers drop through the shaft to a large window onto the outer wall at about 38 m (125 ft) and exit there; deeper exploration to about 55 m is technical only. Visibility often exceeds 30 m, and eagle rays, dolphins and the occasional whale shark are seen. Boat access only.
Facts
- Region: Mariana Islands – Guam & Saipan
- Area: Guam
- Depth: 12–38 m
- Level: advanced
- Current: moderate
- Type: wall, cave, reef
- Coordinates: 13.4335, 144.61 (approximate)
- Highlights: vertical shaft, moray eels, nudibranchs, eagle rays, whale shark, dolphins, pilot whales, sea fans
- Unverified: No published GPS found; the pin is a map-based placement at the right bay/reef and is only indicative. (off Orote Point, per the sources)
- Tips: Watch depth and nitrogen load in the shaft; air-diving limits are reached quickly. Often paired with Hap's Reef or Finger Reef as a shallow second dive.