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Marbo Cave

A limestone cave with a clear pool, a short walk from the road in eastern Guam.

Updated 3 September 2026

Typecave
WhereMangilao
Nearest cityHagåtña
Best seasonDecember to June
Time to allowAn hour or two
Getting thereIn eastern Guam near Mangilao; short walk from the road
EntryFree

Marbo Cave sits close to the road in eastern Guam, a limestone chamber with a pool of very clear cold fresh water in it, reached on a short walk and a scramble down into the opening. Roots hang through the roof and light comes in from the entrance. It is easy to reach compared with most of Guam's caves, which is why it gets used, and the water is deep enough to get into. Guam's northern half is a raised limestone plateau riddled with caves of this kind, most of them far harder to reach.

Highlights

  • The clear pool - cold fresh water filling the chamber floor.
  • The hanging roots - growth coming through the cave roof.
  • The entrance light - the opening that lights the chamber.
  • The easy access - a short walk rather than a serious hike.

When to go

December to June is the drier season. The scramble in is slippery after rain. Weekends bring local visitors.

Things to know

The scramble down into the cave is slippery and awkward. There are no facilities and litter is a problem. Water quality varies and swimming is at your own judgement.

Nearby

Pagat is north, and Tagachang is south.

Key facts

Location13.4871° N, 144.8684° E · map

Source: Wikidata, item Q25192685, read on 18 October 2026.

What to pack for Marbo Cave

Chosen from what this place is for. Tap a kit for the full checklist.

  • Broken-in walking shoes or boots - Grip and ankle support matter more than looks; never hike in brand-new boots. Find on Amazon
  • Reef-safe sunscreen - High SPF that will not bleach the coral you are swimming over. Find on Amazon
  • Head torch + spare batteries - Hands-free light is essential; caves are truly dark. Find on Amazon
  • Layers + a waterproof shell - Mountain weather turns fast; a packable rain jacket saves the day. Find on Amazon

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Plan your trip

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Opening times, ticket prices and seasonal closures change - check the official source before you go: official site.

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