Geography of Guam – The Ultimate Free Guide 2021

Learn facts and Geography of Guam including Major Geographical Features, Natural resources, Region, area, Capital, Border countries, rivers in Guam.

  • Guam: Guåhan is an organized, unincorporated territory of the United States in the Micronesia sub region of the western Pacific Ocean.
  • It is the westernmost point and territory of the United States; in Oceania.
  • Guam shares maritime boundaries with CNMI to the Hawaii. Its location and size make it strategically important.
  • It is the only island with both a protected harbor and land for multiple airports between Asia and Hawaii, on an east–west axis, and between Papua New Guinea and Japan, on a north–south axis

Geography of Guam

Geography of Guam
Figure: wikipedia
  • The rugged geography of guam of the south largely limits settlement to rural coastal areas. The western coast is leeward of the trade winds and is the location of Apra Harbor, the capitol Hagåtña, and the tourist center of Tumon. The U.S. Defense Department owns about 29% of the island, under the management of Joint Region Marianas.

Sovereign state:

United States


544 km2





Bordering Countries:

Guam shares maritime boundaries with CNMI to the Hawaii.

Total Size:

(210 sq mi)

Geographical Coordinates:

13°26′31″N 144°46′35″E

World Region or Continent:


General Terrain:

The island is sharply divided into a northern limestone plateau with a general elevation of about 500 feet (150 metres) and a higher area of volcanic hills to the south. The plateau is covered with a thick growth of jungle, while the volcanic hills support mainly sword grass.

Geographical Highest point:

Mount Lamlam




  • Guam has a tropical rainforest climate, though its driest month of March almost averages dry enough to qualify as a tropical monsoon climate.
  • The weather is generally hot and humid throughout the year with little seasonal temperature variation. Hence, Guam is known to have equable temperatures year-round. Trade winds are fairly constant throughout the year, but there is often a weak westerly monsoon influence in summer.
  • Guam has two distinct seasons: Wet and dry season.
  • The dry season runs from January through May and June being the transitional period.
  • The wet season runs from July through November with an average annual rainfall between 1981 and 2010 of around 98 inches or 2,490 millimeters.

Major cities:

  • Dededo Village
  • Yigo Village
  • Tamuning-Tumon-Harmon Village
  • Mangilao Village
  • Barrigada Village
  • Santa Rita Village
  • Mongmong-Toto-Maite Village
  • Chalan Pago-Ordot Village
  • Yona Village
  • Agat Village
  • Agana Heights Village
  • Talofofo Village
  • Inarajan Village
  • Sinajana Village
  • Merizo Village
  • Asan-Maina Village
  • Piti Village
  • Hagatna Village
  • Hagatna
  • Umatac Village
  • Liguan Terrace
  • Fern Terrace
  • Pago Bay
  • Central Dededo
  • Ordot
  • Maimai
  • Astumbo
  • Astumbo Gardens
  • Chalan Pago
  • Apusento Garden
  • Ghura
  • Mogfog
  • Harmon Garden
  • Kaiser
  • Las Palmas

Major Rivers and Lakes:

Major Rivers:

  • Agaga River
  • Agfayan River
  • Aguada River
  • Ajayan River
  • Alatgue River
  • Almagosa River
  • Aplacho River
  • Asalonso River
  • Asan River
  • Aslinget River
  • Asmafines River
  • Astaban River
  • Atantano River
  • Atate River
  • Big Guatali River
  • Bile River
  • Bolanos River
  • Bonya River
  • Bubulao River
  • Cetti River

Natural Resources:

  • Coral Reefs: Essential Ecosystems on Guam.
  • Guam’s Amazing Caves.
  • Fungus in Guam’s Forests.
  • Limestone Forests of Guam.
  • Guam’s Balate’
  • Restoring Guam’s Coral Reefs.
  • Sharks, Rays, Whales and Dolphins of Guam.
  • Tuninos: Dolphins and Their Cousins in Guam Waters.

Major Geographical Features:

Biomes & Ecosystems:

Tropical and subtropical dry broadleaf forests.


A coral table reef surrounds most of Guam, and the limestone plateau provides the source for most of the island’s fresh water. Steep coastal cliffs dominate the north, while mountains inform the topography of the island’s southern end; lower hills typify the area in between.


North Pacific Ocean

Mountain Ranges:

  • Mount Lam Lam
  • Mount Bolanos
  • Mount Almagosa

See Also:

World Map



Naveed Tawargeri

Hi, I'm Naveed Tawargeri, and I'm the owner and creator of this blog. I'm a Software Developer with a passion for Programming. 

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