A big town of Isan, the northeastern plateau, about two hours by road from Vientiane across the Lao border. Winter mornings of red lotus on a lake and the Bronze Age site of Ban Chiang made its name, and Vietnamese settlers' dishes became its breakfast. Go December to February, in lotus season.
Pink lotus covers Nong Han lake about 45km southeast of town, hence the name Red Lotus Sea. It blooms from December to February, opening in the morning and closing by midday, so take a boat at sunrise. Boats are hired one at a time at the pier.
OPEN IN MAPSA prehistoric site found in the 1960s when red swirl-painted pottery surfaced in a village lane, listed by UNESCO in 1992. At Wat Pho Si Nai a pit keeps skeletons and pots as they lay, and a national museum of the finds stands at the village entrance.
OPEN IN MAPSA park round a lake in the centre of town, crowded at dusk with residents running and walking the circuit. Food stalls and aerobics groups gather on the shore, and an evening market fills the street beside it. With almost no shade, by day it is empty.
OPEN IN MAPSWind-carved mushroom rocks are scattered over a sandstone hill, with prehistoric paintings and Dvaravati-era boundary stones under their overhangs. UNESCO inscribed it in 2024. It lies some 70km northwest, so hire a car.
OPEN IN MAPSA white hall on a forested ridge holding a marble reclining Buddha, reportedly carved from Italian stone. It lies in the Na Yung forest, close to two hours' drive from town, and knees and shoulders must be covered to enter the hall.
OPEN IN MAPSA small forest island in a marsh, believed guarded by a naga serpent in the water, so pilgrims never stop coming. A bridge leads to the shrine in the trees for flowers and incense, and a dress code applies. Weekends bring busloads from across the country.
OPEN IN MAPSA village about 15km north of town known for khit, Isan cloth with its pattern picked into the weave thread by thread. Shops line the main road, some with looms working out back. Handwoven and machine-made pieces of one design differ widely in price, so ask.
OPEN IN MAPSA sculpture park in Nong Khai, an hour north of Udon, where the mystic Bunleua Sulilat raised a forest of giant concrete figures. A Buddha seated under a seven-headed naga stands more than 20m high. Across the nearby Mekong lies Laos.
OPEN IN MAPSA forest monastery founded by Luang Ta Maha Bua, a revered meditation master, where monks still keep a strict rule. It is a place of practice, not a sight: speak softly and wear white or modest clothes. A stupa with his relics stands in the grounds.
OPEN IN MAPSA reservoir north of town where you rent a roofed bamboo raft, float on the water and order som tam and grilled chicken. Each raft is hired whole and small boats ferry out the food. At weekend lunchtimes families fill every one.
OPEN IN MAPSA Chinese shrine built by Thai-Chinese traders on Nong Bua lake east of downtown, red pillars and dragon roofs along the shore. Beside it a garden of pavilions and bridges juts over the water. Chinese festival days bring incense and firecrackers.
OPEN IN MAPSA cave temple set into a sheer limestone face in Nong Bua Lamphu, about 50km west of Udon, its white seated Buddha visible from the highway. Over 600 steps lead in, and the cave opens onto the far side above the fields. Bring a phone torch for the dark.
OPEN IN MAPSA mustard-yellow colonial building put up as a girls' school in the 1920s, now covering the town's founding, Isan household tools and photos from the US air base years of the Vietnam War. It sits beside Nong Prajak Park, so it pairs easily with a walk there.
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