What is Isaan in Thailand?

Isaan (also spelled Isan or E-san) is Thailand's largest geographical region, comprising 20 provinces in the northeast of the country. It borders Laos to the north and east, and Cambodia to the southeast. It is home to about a third of Thailand's population.

Is Isaan worth visiting?

Absolutely. Isaan offers authentic Thai culture, extraordinary Khmer temples, excellent food, Mekong River scenery, and a fraction of the tourist crowds found in Bangkok, Phuket, or Chiang Mai. It is increasingly recognized as one of Thailand's most rewarding regions for independent travelers.

What is the main city of Isaan?

Nakhon Ratchasima (commonly known as Korat) is the largest city in Isaan and the second-largest in Thailand. It serves as the gateway to the region from Bangkok.

Isaan: Northeast Thailand — Where the Real Thailand Lives

Thailand’s northeast — known as Isaan (อีสาน) — is the country’s largest and most often overlooked region. While international tourists concentrate in Bangkok, Chiang Mai, and the southern islands, Isaan sits largely undiscovered, offering a Thailand that is rawer, more authentic, and in many ways more fascinating than the tourist-beaten trail.

I have lived in Korat, the region’s largest city, for many years. This is my home, and I can tell you that Isaan rewards the curious traveler richly.

Geography and Overview

Isaan occupies the Khorat Plateau, a vast elevated plain in northeastern Thailand. It encompasses 20 provinces, borders Laos along the Mekong River to the north and east, and shares a border with Cambodia to the southeast. With a population of around 22 million, Isaan is home to roughly a third of all Thais.

The region has a distinct cultural identity shaped by its Lao and Khmer heritage, its agricultural economy (rice, sugarcane, cassava), and its relative economic marginalization compared to Thailand’s central plain and tourist coasts.

Culture and People

Isaan culture has deep roots in the Lao and Khmer worlds. The local dialect (Isan) is closely related to Lao, and older residents often speak both. The region’s traditions, music (mor lam), textiles, and cuisine all reflect this distinct cultural identity.

Isaan people are known throughout Thailand for their warmth, humor, and resilience. The region has contributed immensely to Thailand’s cultural life — most of Thailand’s domestic migrant workers come from Isaan, and mor lam music has gone from regional folk tradition to national phenomenon.

Korat: The Gateway City

Nakhon Ratchasima — universally known as Korat — is the region’s hub and Thailand’s second-largest city by population. It sits where central Thailand meets Isaan, making it a natural entry point for the northeast.

Korat is not a typical tourist destination — it lacks the glossy infrastructure of Chiang Mai or Phuket — but it has a great food scene, a lively expat community, and serves as a base for exploring the wider region. The Thao Suranaree monument (commemorating a local heroine who defeated a Lao army in the 19th century) is a major cult site and a window into local devotion and history.

For food, bars, and restaurants in Korat, see our extensive guides on this site.

Khmer Temples of the Northeast

Before the Thai kingdoms rose, Isaan was part of the Khmer Empire. The region is dotted with extraordinary Khmer temples, far less visited than Angkor Wat but deeply impressive:

Prasat Hin Phimai (Nakhon Ratchasima): One of the largest and best-preserved Khmer temples in Thailand, predating many of Angkor’s structures.
Prasat Hin Phanom Rung (Buriram): A stunning temple on an extinct volcano, perfectly aligned with the rising sun during certain times of year.
Prasat Mueang Tam (Buriram): A quieter, atmospheric companion to Phanom Rung.
Temple of Preah Vihear (Si Saket border): Dramatically situated on the Thai-Cambodian border escarpment. See our full guide: Temple of Preah Vihear.

Mekong River

The northern border of Isaan is defined by the Mekong River, one of the world’s great waterways. Towns like Nong Khai, Nakhon Phanom, and Mukdahan sit directly on its banks, offering sunsets over Laos, fresh river fish, night markets, and a distinctly border-town atmosphere that is unlike anywhere else in Thailand.

The Friendship Bridge at Nong Khai connects Thailand to Vientiane, Laos — a straightforward crossing for those venturing further afield.

Food: The Best in Thailand?

Many Thai food experts consider Isaan cuisine to be Thailand’s most exciting. Characterized by bold flavors — sour, spicy, funky fermented fish pastes — Isaan food includes dishes that have become national staples:

Som tam (green papaya salad) — the Isaan dish that conquered Thailand.
Gai yang (grilled chicken) with sticky rice.
Laab (minced meat salad with toasted rice powder and herbs).
Khao niao (sticky rice) — the staple grain of Isaan, eaten with everything.

In Korat, you can find everything from authentic street food to international restaurants. See our restaurant guides for specific recommendations.

National Parks and Nature

Isaan has excellent natural attractions that most visitors miss:

Khao Yai National Park — a UNESCO World Heritage site on Isaan’s southwestern edge, with elephants, gibbons, hornbills, and waterfalls.
Pa Hin Ngam National Park (Chaiyaphum) — extraordinary rock formations and wildflowers in season.
Phu Kradueng National Park (Loei) — a cool plateau popular with Thai trekkers, strikingly beautiful in the cool season.

Getting to Isaan

From Bangkok, Korat is easily reached by bus (about 3 hours), train, or a short flight. The new Korat-Nong Khai high-speed rail line (under construction) will eventually connect Bangkok to the northeast much faster. Once in Korat, rent a car for flexible exploration of the wider region — public transport between smaller towns is infrequent.

Conclusion

Isaan is Thailand for people who want to see more than Thailand’s highlight reel. It rewards effort with authentic encounters, extraordinary historical sites, great food, and the warmth of people who are genuinely pleased to see visitors who bothered to make the journey. If you’ve been to Bangkok and the beaches, it’s time to head northeast.

About This Place

Phimai Historical Park – Khmer Temple Complex. Located in Phimai District, Nakhon Ratchasima Province, approximately 60 km from Korat city. One of the most important Khmer ruins in Thailand, dating from the 11th-12th centuries. Popular spot for locals and expatriates in the region.

Have questions about living or working in Thailand? Contact Sebastien Brousseau – French-speaking lawyer based in Korat (Nakhon Ratchasima).

Isaan ! Northeast Thailand