Tumon Bay

If you visit Guam, it is quite likely that Tumon Bay will be the place you stay. This large sandy beach, about 1,5 miles long, is filled with resorts, restaurants and bars. Fringed by a large and stunning lagoon, ideal for beginners, and offering a stunning reef drop-off to experienced snorkelers, it is the most accessible (and the busiest) snorkeling spot in the island.
How to get there?

Located on the West side of the island, a 10-minute drive from the airport ($25-30 by taxi), Tumon Bay is the main seaside resort in Guam, where most of the luxury hotels are concentrated.

Water entrance

You can enter the water anywhere along the beach, but if you plan to explore the reef drop-off, you should enter the water approximately in front of the channel (see map).

Aerial view


This spot can be divided into two areas: the vast shallow lagoon, starting from the beach and some 400 yards wide, ideal for beginners, and the reef drop-off area, that should be only explored by the most experienced snorkelers.

The lagoon
Tumon Bay lagoon is an ideal place for a first time snorkeling. The water is warm, clear and shallow (↕2-4ft/0.5-1m), with absolutely no currents and no waves. The seabed is mostly sandy with scattered coral areas, which grow denser as you move closer to the reef. Although the lagoon is shallow and there is little coral, you can still observe several species of fish, including butterflyfish, triggerfish, Moorish idols and damselfish. The lagoon can be explored at almost any time of year, since the waters are particularly well sheltered.

Snorkeling Report Tumon Beach Guam Clownfish

The drop-off
The barrier reef and its drop-off are located about 400 yards from the shore. You can identify this area from the beach because of the waves breaking there (a white line). On your way to the reef edge, 50 yards before the barrier, the coral becomes so dense that it’s difficult to go further, but some channels allow you to go out on the other side of the reef. On the drop-off (↕3-12ft/1-4m), which plunges abruptly down toward ocean’s depth (↕100ft/30m), the seabed is exceptional. In the presence of the density and variety of the marine life here, you will not know which way to look. Swim along the reef edge and, here and there, you will surely spot shoals of surgeonfish, emperor and royal angelfish meandering alone, huge triggerfish, and maroon clownfish playing in their anemone.

Tomato clownfish on Tumon Bay's reef drop-off

Please keep in mind that only the more experienced snorkelers can adventure in this area, and only when the sea conditions permit. Be careful and postpone your swim if sea conditions are poor, since this spot can be extremely dangerous. Always keep at a safe distance from the channel, as boats and jet skis use it to reach the open ocean. As the spot is extensive and particularly pleasant, you should protect yourself from the sun since you are likely to spend longer in the water than you first planned.

Restaurants and accommodation

There are a dozen upmarket hotels on the beach, facing the lagoon. In this area, along Pale San Vitores Road, you will find a large number of places to eat and shop.

Snorkeling Report gives the most precise tips possible about the snorkeling spots and potential dangers, but each one of us is responsible for our own safety in the water. For more information, take a look at the snorkeling safety page. If you want to add extra information or make any corrections to the spot descriptions, please contact us.

Spot’s weather forecasts (°C)

Spot tips

  • Type of spot
  • Level of difficulty
    Beginner (in the lagoon only)
  • Maximum depth
    3ft in the lagoon, 100ft on the drop-off
  • Water entrance
    Easy, from a sandy beach
  • Lifeguard
  • Visitor numbers
  • Access costs
  • Restaurants nearby
  • Public toilets & showers

Spot map

Spot photos

Underwater spot photos

Species you may spot while snorkeling Tumon Bay

Common name Scientific name Abundance Fishbase Wikipedia
Whitetail dascyllus
Dascyllus aruanus
Double-saddle butterflyfish
Chaetodon ulietensis
Chevron butterflyfish
Chaetodon trifascialis
Ornate butterflyfish
Chaetodon ornatissimus
Teardrop butterflyfish
Chaetodon unimaculatus
Tomato clownfish
Amphiprion frenatus
Yellow tang
Zebrasoma flavescens
Clown surgeonfish
Acanthurus lineatus
Blue sea star
Linckia laevigata
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You encountered a specie at this spot that is not listed here?