Mt. Lam Lam: Guam's Highest Peak

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Hike Guam's highest point, Mt. Lam Lam, and experience breathtaking views from the "world's tallest mountain" measured from the Mariana Trench!

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Mt. Lam Lam

Hike to the summit of Mt. Lam Lam, Guam's highest peak, for panoramic views and a unique claim to fame as the world's tallest mountain when measured from the nearby Mariana Trench. Experience the island's natural beauty and cultural significance on this rewarding trail.

A brief summary to Mt. Lam Lam

Local tips

Bring plenty of water, as the hike can be strenuous, especially in Guam's humid climate.
Wear sturdy hiking shoes and consider long pants to protect against sharp sword grass.
Check the weather forecast before you go, as the trail can be slippery after rain.
Hike in the early morning or late afternoon to avoid the midday heat.
Take your time and enjoy the panoramic views from the summit.

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Getting There

Driving

From Tumon Bay, take Marine Corps Drive (Route 1) south. Turn left onto Route 2A, then continue onto Route 2. Drive through Agat and continue for approximately 3 miles. Look for a red wall on the right side of the road where you can park. The trailhead is across the street on the left, marked by a small green trail sign. Parking is free at the Cetti Bay Overlook.
Public Transport

Take a bus to the nearest stop on Route 1. From there, it's approximately a 30-minute walk to the trailhead. Bus fares vary depending on the distance traveled, but a one-way trip typically costs around $3 - $5. Check local bus schedules for accurate times and routes.
Taxi/Ride-share

Taxis and ride-sharing services are available throughout Guam. A ride from Tumon Bay to the Mt. Lam Lam trailhead will cost approximately $40 - $50. Be sure to confirm the fare with the driver before starting your trip.

Discover more about Mt. Lam Lam

Mt. Lam Lam, meaning "lightning" in the Chamorro language, is a must-visit destination for nature enthusiasts and those interested in Guam's rich history. While modest in height at 406 meters (1,332 feet) above sea level, it holds a unique distinction. Measured from its base on the ocean floor in the nearby Mariana Trench, the deepest part of the ocean, Mt. Lam Lam is considered by some to be the world's tallest mountain.The hike to the summit offers stunning 360-degree views of Guam's mountain terrain and rugged coastlines. The well-worn trail passes through diverse terrain, including dense jungle, breezy savannahs, and rocky patches. Be prepared for steep sections and potential mud, especially after rain. Sword grass along the trail can be sharp, so long pants are recommended.Along the way, you'll find small white crosses marking the "Stations of the Cross," a tradition for Guam's Catholic community. A side trail leads to Mt. Jumullong Manglo, Guam's second-highest peak, also adorned with large crosses. The main trail continues to Mt. Lam Lam's summit, where a concrete platform holds a geodetic marker and flags of Guam and the United States.