US Pacific territories: how to tell them apart

3 places · Updated 4 November 2026

These three islands belong to the United States, yet they sit thousands of kilometres out in the Pacific, far closer to Asia or New Zealand than to the American mainland. Guam and the Northern Mariana Islands are neighbours in the Mariana chain of western Micronesia. American Samoa lies far to the south-east in Polynesia, just below the equator.

Because they are American, all three drive on the right and use American-style road signs: red eight-sided STOP signs, yellow diamond warnings and white rectangular speed limits. English is on almost every sign, so the local language is your best clue. Guam and the Marianas share Chamorro, with greetings like "Håfa adai" and a sprinkling of Spanish place names. American Samoa speaks Samoan, a Polynesian language packed with vowels, where "Talofa" means hello and "fale" means house.

The scenery helps as well. Guam and Saipan mix flat limestone country, thick scrubby jungle and coral beaches inside calm lagoons. American Samoa is all steep, dark-green volcanic ridges plunging into the sea, with villages squeezed along one coastal road.

Their closest look-alikes are each other, Hawaii (part of the United States) and independent Samoa, which looks almost exactly like American Samoa but drives on the left.

At a glance

🇬🇺 Guam

Guam is the largest and busiest island in Micronesia. It feels like small-town America moved to the tropics: wide highways, shopping centres, fast-food chains and US road signs among palm trees and coral beaches. Chamorro names, often with the letter å, are what set it apart from Hawaii.

Language and signs

Official signs are in English, but many village and street names are Chamorro. Look for the letter å, as in Hagåtña (the capital) and Inalåhan. "Chalan" means road, and "Håfa adai" is the friendly greeting on many shopfronts. Around Tumon's hotels, Japanese and Korean appear too.

Roads

Traffic drives on the right, with American-style yellow centre lines, white edge lines and speed limits in miles per hour. A wide, busy highway follows the west coast past Hagåtña and Tumon, while quieter two-lane roads loop around the hilly south.

Landscape and towns

The north is a raised limestone plateau, flat and covered in dense, scrubby forest, ending in tall sea cliffs. The south is older volcanic land: rolling hills of reddish soil and tall grass, with rivers running down to small bays. Coconut palms, breadfruit and red flame trees grow around villages.

Most houses are single-storey concrete boxes with flat roofs, built strong for tropical storms and often painted cream or pastel. Villages usually have a Catholic church, a sign of Spanish influence going back to the 1600s. Tumon is lined with big hotels and malls, and Hagåtña has ancient latte stones.

Easily confused with

• Northern Mariana Islands: The Northern Marianas share Chamorro and American signs, but Guam is bigger and busier, with more multi-lane highways and malls. A single lagoon road with a small resort strip suggests Saipan.
• United States: Hawaii has the same signs and tropical scenery, but Hawaiian names such as Kailua and Waianae use only vowels plus h, k, l, m, n, p and w, and never å.

Did you know? Guam sits just west of the International Date Line, so its day starts before the rest of the United States. Its slogan is "Where America's Day Begins". The Challenger Deep, the deepest known point in any ocean, lies in the Mariana Trench south-west of Guam.

🇲🇵 Northern Mariana Islands

The Northern Mariana Islands are a chain of 14 islands stretching north from Guam. Most people live on Saipan, with smaller communities on Tinian and Rota. Saipan's flat west coast is where hotels, shops and homes line a road beside a calm, turquoise lagoon, backed by a green limestone ridge.

Language and signs

Road signs are in English, and many village names are Chamorro or Spanish, such as Chalan Kanoa, San Vicente and Garapan. Carolinian, the language of families whose ancestors sailed here from the Caroline Islands, is also spoken. In Garapan's tourist streets, shop signs often add Chinese, Korean or Japanese.

Roads

Cars keep to the right, with American-style signs and road markings. On Saipan, Beach Road runs beside the lagoon with a walking and cycling path alongside, while Middle Road carries traffic through the centre of the island.

Landscape and towns

Saipan's west side is low and sandy, sheltered by a reef that keeps the lagoon calm. Inland, the ground rises to Mount Tapochau, the highest point, and the east coast is rocky and wild, with cliffs and rough surf. Scrubby thickets, coconut palms and flame trees are everywhere. Tinian is flatter, and Rota has a high, forested plateau.

Garapan is the main tourist town, a grid of hotels, restaurants and shops. Elsewhere, villages are spread out, with single-storey concrete houses, small grocery stores and Catholic churches. Rota's main village, Songsong, sits on a narrow neck of land beneath a flat-topped mountain nicknamed the Wedding Cake.

Easily confused with

• Guam: Guam is larger and more built up, with wider highways and bigger shopping centres. A single coastal road beside a long lagoon and a compact resort town point to Saipan.
• American Samoa: American Samoa has the same signs, but its scenery is much steeper and wetter, with jungle-covered mountains right behind the shore and Samoan names like Pago Pago.

Did you know? On Tinian, the House of Taga has some of the largest latte stones ever raised. These stone pillars once held up the buildings of the ancient Chamorro people.

🇦🇸 American Samoa

American Samoa is a small group of Polynesian islands and the only inhabited part of the United States south of the equator. Most people live on Tutuila, a narrow, mountainous island almost cut in two by the deep harbour of Pago Pago. Expect steep rainforest, open-sided Samoan houses and American road signs.

Language and signs

Official signs are in English, while Samoan appears in place names and on many churches and shops. Samoan has lots of vowels and apostrophes, as in Nu'uuli. The letter g is said "ng", so Pago Pago sounds like "Pango Pango". "Talofa" means hello.

Roads

Driving is on the right, as in the rest of the United States. One main road follows the south coast of Tutuila, squeezed between the mountains and the sea. Look out for aiga buses: small, brightly painted buses with home-built wooden bodies, often playing loud music.

Landscape and towns

Tutuila is made of old volcanoes, so flat land is scarce. Sharp ridges covered in thick rainforest rise straight from the shore, and Rainmaker Mountain towers over Pago Pago harbour, often wrapped in cloud. The one wide, flat area is the Tafuna plain in the south-west, where the airport is. Frequent rain keeps everything deep green.

Villages run in a line along the coast. Many homes are concrete with metal roofs, but you'll also see the Samoan fale, a building with a rounded roof on posts and no walls, used for meetings and family gatherings. Large, colourful churches stand in nearly every village.

Easily confused with

• Samoa: Independent Samoa shares the language, the fale and the colourful buses, but its traffic drives on the left. American Samoa drives on the right with US-style signs.
• Guam: Guam has the same American signs but is far busier, with Chamorro rather than Samoan names. Its northern half is flat, whereas Tutuila has hardly any level ground.

Did you know? The National Park of American Samoa is the only US national park south of the equator. It protects rainforest, coral reefs and big fruit bats called flying foxes.

Quick round-up: American signs, Chamorro names and multi-lane highways mean Guam. A lagoon-side resort strip on a smaller, quieter island suggests Saipan in the Northern Marianas. Steep jungle ridges, fale and Samoan names with cars on the right mean American Samoa. The same Samoan scenery with cars on the left is independent Samoa instead.

Further reading

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