Isaan

Isaan is the north-east of Thailand: a broad plateau between the Mekong River, which forms the border with Laos, and the Cambodian frontier in the south. Few foreign tourists come compared with the beaches or Chiang Mai, but it has Khmer temples such as Phanom Rung, easygoing Mekong towns like Nong Khai, two UNESCO World Heritage Sites and the food that much of Thailand loves most.

The region covers around a third of the country and is home to a large share of its people, many of whom speak Isaan, a language closely related to Lao, alongside Thai. Life here is more rural and slower than in Bangkok, prices are lower and English is less common. It suits travelers who like trains, local markets and places where they will not see many other visitors.

One thing to know before you plan: the southern edge of Isaan borders Cambodia, and that border area is under current government travel warnings. The section on travel advice below explains what that means for the temples.

The Cambodian border: what the travel advice says

The UK Foreign, Commonwealth and Development Office (FCDO) advises against all but essential travel to areas within 20 km of Thailand's land border with Cambodia, after fighting along parts of the border in July 2025 and further clashes in early December 2025. It reports that the land border crossings with Cambodia remain suspended, that the Khao Phra Wihan (Preah Vihear), Ta Kwai and Ta Muen Thom temples are closed, and that there are unexploded landmines in the area.

The US State Department rates Thailand as a whole at Level 1 and asks travelers to "exercise increased caution" (Level 2) near the Thai-Cambodian border because of the risk of armed conflict. It adds that Thai authorities may set up security exclusion zones at short notice.

For Isaan this matters mainly in the southern provinces of Buriram, Surin, Si Sa Ket and Ubon Ratchathani. By our own measurement on OpenStreetMap border data, Phanom Rung lies about 30 km and Muang Tam about 25 km from the border, so both are outside the 20 km zone, though not by much. Surin town is roughly 50 km away, Buriram town and Si Sa Ket town more than 70 km. Check the latest advice before you go, follow any road closures, and never leave marked paths near the border. Going against FCDO advice can affect UK travel insurance; see our page on travel insurance for Thailand.

Khon Kaen and Udon Thani: the two big hubs

Khon Kaen sits near the middle of Isaan on the railway and the main highway to Laos. It is a university and business city with modern malls, a lake in the center and a good range of hotels, which makes it a practical base rather than a sight in itself. Bolt and Grab both operate here, which helps in a city where songthaew routes are hard for visitors to read; our comparison of Bolt and Grab explains the difference.

Udon Thani, about 120 km further north by road, is the gateway to two UNESCO World Heritage Sites. Ban Chiang, inscribed in 1992, is a prehistoric settlement site known for its painted pottery and early bronze. Phu Phrabat, inscribed in 2024, protects sandstone outcrops and sima (boundary) stones from the Dvaravati period in hilly forest north-west of the city. Udon also has a large expatriate community, and its airport is the most convenient for Nong Khai and Vientiane.

Nong Khai and the Mekong towns

Nong Khai, about 50 km north of Udon Thani, is the most relaxed town in the region and the gateway to Laos across the First Thai–Lao Friendship Bridge. It has a riverside promenade, the extraordinary sculpture park of Sala Keoku, and trains that now run across the bridge to Vientiane. We cover it in detail in Nong Khai and the Mekong.

Further along the river, small towns reward slow travel. Chiang Khan in Loei province is known for its wooden riverside houses; Nakhon Phanom faces the mountains of Laos across a wide stretch of the Mekong; and That Phanom, south of it, has one of the region's most revered stupas, Phra That Phanom, which is on Thailand's UNESCO Tentative List. Mukdahan has the Second Friendship Bridge to Savannakhet. Buses link these towns, but services can be infrequent, so many travelers hire a car or driver.

Inland in Loei, Phu Kradueng National Park is a flat-topped mountain with a long hiking trail to the summit plateau. For the 2026–27 season the park is open for summit visits and overnight stays from 1 October 2026 to 31 May 2027, with set hours for climbing up and down.

Phanom Rung and the Khmer temples of the south

The Khmer Empire once ruled much of what is now Isaan, and its stone sanctuaries are the region's greatest sights. The finest is Phanom Rung in Buriram province, a sandstone temple built on the rim of an extinct volcano and approached by a long processional way and naga bridges. The Fine Arts Department restored it between 1971 and 1988, when it was declared a historical park.

Phanom Rung is known for a solar alignment: four times a year the sun shines straight through all fifteen doorways of the sanctuary. According to the historical park, as reported in the Thai press, this happens at sunrise around 3–5 April and 8–10 September, and at sunset around 5–7 March and 5–7 October. The exact days shift by about a day each year and cloud often spoils the view, so check the park's announcement first. The park's office can be reached on 044 666 251.

A short drive away, Prasat Muang Tam is a lower, walled temple with lotus ponds and fine carvings, and it is usually far quieter. Together with the small Plai Bat sanctuaries, Phanom Rung and Muang Tam are on Thailand's UNESCO Tentative List (since 2019). That means they are proposed for World Heritage status; they are not World Heritage Sites, whatever some tour adverts say.

Further north-west, Phimai Historical Park in Nakhon Ratchasima province protects a large Khmer temple in the middle of a small town, an easy trip from Korat. Entry fees at the Khmer sites are set by the Fine Arts Department; we could not confirm current foreign-visitor prices online, so check them at the ticket office. If temples are your reason to travel, compare with Thailand's older capital at Sukhothai, and dress as you would for any active temple; the guide to temple etiquette covers what to wear.

The food of Isaan

Isaan food is eaten all over Thailand, often cooked by people from the north-east. Here it is cheaper, usually spicier and much more varied. The basic meal is sticky rice, eaten with the hand, with grilled meat and a salad or dip.

• Som tam: green papaya salad pounded in a mortar, from mild with peanuts to very hot with fermented fish.
• Larb: minced meat salad with lime, chili, mint and toasted rice powder.
• Gai yang: grilled marinated chicken, best from a roadside charcoal grill.
• Pla ra: fermented fish sauce, the strong flavor behind many dishes; ask for food "mai sai pla ra" if you want to avoid it.
• Sai krok Isaan: slightly sour fermented pork and rice sausages.

Ask for "phet nit noi" (a little spicy) unless you know your limit. Our regional guide to Thai dishes has more, and the advice in avoiding stomach trouble from street food applies especially to raw and fermented dishes. A few words of Thai help a lot here; see our essential Thai phrases.

Getting to and around Isaan

By train. Two lines cross the region from Bangkok: the north-eastern line through Khon Kaen and Udon Thani to Nong Khai and on to Vientiane, and the line through Korat and Buriram to Ubon Ratchathani. Long-distance trains leave from Krung Thep Aphiwat Central Terminal. The State Railway sells tickets for the special expresses 23/24 (Ubon) and 25/26 (Nong Khai) up to 90 days ahead and for most other trains up to 30 days ahead. See how to book Thai trains online and the guide to night trains.

By air. Several Isaan cities, including Udon Thani, Khon Kaen, Ubon Ratchathani and Buriram, have airports with flights from Bangkok. Flying saves a long day, and the train is the better experience if you have time.

By road. Buses to every provincial town leave from Bangkok's northern bus terminal (Mo Chit). Distances within Isaan are long and local buses slow, so hiring a car with or without a driver is common for the temple circuit and the Mekong towns. Coming from Bangkok by road, you pass the area of Khao Yai; note that Khao Yai National Park has been closed indefinitely since 25 September 2026 after flood damage.

When to visit

The cool, dry months from November to February are the most comfortable, with clear skies and cooler mornings. March to May is very hot. The rainy season runs roughly from May to October; the UK government notes that heavy rain can cause flash floods and landslides, particularly in northern, north-eastern and mountainous areas. Festivals add reasons to time a trip: Buddhist holy days are marked with candle processions at temples, and the rocket festivals of the hot season are a famous Isaan tradition. Our overview of Thailand's weather by month compares the regions.

Frequently asked questions

Is it safe to visit Phanom Rung?

Phanom Rung lies roughly 30 km from the Cambodian border by our measurement, outside the 20 km zone where the UK FCDO advises against all but essential travel (as of October 2026). Check the latest UK or US advice before you go, follow local instructions, and do not travel on towards the border temples, which are closed.

Is Phanom Rung a UNESCO World Heritage Site?

No. Phanom Rung, Muang Tam and the Plai Bat sanctuaries are on Thailand's UNESCO Tentative List since 2019, which means they are proposed but not inscribed. Isaan's World Heritage Sites are Ban Chiang and Phu Phrabat in Udon Thani province.

What is the best base for exploring Isaan?

Khon Kaen and Udon Thani are the most practical bases, with good hotels, airports and the railway to Nong Khai. For the Khmer temples, stay in Buriram or Nang Rong near Phanom Rung, or in Korat for Phimai.

How do you get from Bangkok to Isaan?

By train from Krung Thep Aphiwat Central Terminal on the lines to Nong Khai and Ubon Ratchathani, by bus from Mo Chit, or by a short domestic flight to cities such as Udon Thani, Khon Kaen, Ubon Ratchathani or Buriram.

When is the sun aligned with Phanom Rung's doors?

Four times a year: at sunrise around 3–5 April and 8–10 September, and at sunset around 5–7 March and 5–7 October, according to the historical park as reported in the Thai press. Dates vary by about a day, so check the park's announcement.

Sources

• UK FCDO – Thailand travel advice: warnings and insurance (checked October 2026)
• U.S. Department of State – Thailand Travel Advisory (checked October 2026)
• UNESCO World Heritage Centre – Thailand: properties and Tentative List (checked October 2026)
• Fine Arts Department – Phanom Rung Historical Park (checked October 2026)
• MGR Online – Sun through the 15 doors of Phanom Rung at sunset (checked October 2026)
• Tourism Authority of Thailand – SRT opens 90-day advance booking (checked October 2026)
• Bolt – Cities in Thailand (checked October 2026)
• Explera – National park closures and reopenings after the rains, 2026 (Phu Kradueng season) (checked October 2026)
• Department of National Parks – Khao Yai closure extended, September 2026 (checked October 2026)