Gun Beach

Gun Beach, a secluded cove at the far end of Tumon Bay, is considered by many locals to be one of the best shore snorkeling on Guam. It includes shallow areas protected by a coral quarry and reefs open onto the ocean, and you can explore a range of environments and varied marine life: a whole medley of fish, blue sea star, giant clams and, if you’re lucky, an encounter with a black tip shark, which pay regular visits to the site.
How to get there?

Gun Beach is a sandy beach at located the north end of Guam’s main tourist town, Tumon. From Tumon Bay and the main resorts, it takes 5 minutes by car to reach the beach. Drive north on Pale San Vitores Road and, at the top of the hill, go straight along the narrow road (named Gun Beach Road) serving the cove. The site is very well signposted.

Water entrance

You can enter the water anywhere along the beach, but in order to get easy access to the outer part of the reef, you should enter the water approximately in front of the channel (see map below).

Aerial view


The area to explore covers the outer part of the reef, located around 60 yards away from the beach at this point. In the lagoon, the sea bed is relatively poor, and there is little interest in exploring it. Make your way between the rocks and corals (or use the narrow channel dug by fishermen -see map below) and go out on the other side of the reef.

Snorkeling Report Gun Beach Guam Triggerfish
Reef triggerfish at Gun Beach, Guam

The first dozen meters or so from the barrier (where the waves are breaking) are shallow (↕4-8ft/1-2m) and covered by relatively damaged coral. In places, new colonies are taking root. Move away from the barrier to reach deeper areas (↕8-15ft/2-5m). Here you will find the best seabed in Gun Beach: the diversity of coral is striking and the underwater life impressive in density. Shoals of striped monocle bream (scolopsis lineatus) rest above the coral beds, while surgeonfish and butterflyfish (more than 5 species) with spectacular colors come and go along the reef. Several species of triggerfish inhabit this spot, including reef triggerfish, lagoon triggerfish, orange-lined triggerfish, and the elegant pinktail triggerfish. Look for the rare and charming lemonpeel angelfish, a bright yellow fish with sky-blue highlights encircling the eyes, always seen in couples. And if you are lucky, you may be surprised by a black tip reef shark darting between the coral beds.

Be careful and postpone your swim (or stay in the inner part of the reef) if sea conditions (waves or currents) are bad.

Restaurants and accommodation

There is a beach bar (The Beach Bar & Grill) right in front of the spot. A wide range of restaurants and accommodation can be found in Tumon Bay (along Pale San Vitores Road), about 1 mile (1,6km) from here.

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

  • Level of difficulty
  • Maximum depth
    3ft in the lagoon, 20ft 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 Gun Beach

Common name Scientific name Abundance Fishbase Wikipedia
Mailed butterflyfish
Chaetodon reticulatus
Ornate butterflyfish
Chaetodon ornatissimus
Double-saddle butterflyfish
Chaetodon ulietensis
Moorish idol
Zanclus cornutus
Yellow longnose butterflyfish
Forcipiger flavissimus
Convict surgeonfish
Acanthurus triostegus
Clown surgeonfish
Acanthurus lineatus
Reef triggerfish
Rhinecanthus rectangulus
Orange-lined triggerfish
Balistapus undulatus
Pinktail triggerfish
Melichthys vidua
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You encountered a specie at this spot that is not listed here?