Things to Do in Ubon Ratchathani in May

Pha Taem sits on the sandstone escarpment above the Mekong, about 90 km (56 miles) east of Ubon Ratchathani city. May is when the park transitions from scorched dry-season brown to vivid green that makes the cliff paintings pop against the rock face. The 1.5 km (0.9 mile) cliff trail runs along the edge with the Mekong far below. The prehistoric paintings, some dating back 3,000 years, depict fish, handprints, and geometric patterns in rust-red ochre that stands out sharply once the surrounding rock darkens from moisture. Go at sunrise. The eastern-facing cliffs catch the first light over Laos. The temperature at 6 AM is still tolerable, around 26°C (79°F), before the humidity locks in. The Soi Sawan waterfall inside the park starts flowing properly in May. The sound of water on rock after months of silence is worth the early alarm. Expect to spend three to four hours if you do the full trail at a comfortable pace.

Khong Chiam sits at the confluence where the Mun River meets the Mekong, about 80 km (50 miles) east of the city. In May you can still see the two-toned water where the muddy brown Mun bleeds into the darker Mekong. This phenomenon fades as the wet season intensifies and both rivers run the same turbid color. May is effectively the last month to catch it clearly. The town itself is small, quiet, and feels like Isan twenty years ago: wooden shophouses, a riverside promenade where older men fish in the late afternoon, and a morning market where sticky rice comes wrapped in banana leaves still warm from the steamer. The border atmosphere is tangible here. Laos is visible across the water. The cultural overlap shows in the food, the temple architecture, and the Lao-inflected Isan dialect you will hear everywhere. Half a day is enough for the river junction and the town. Combining it with Pha Taem makes for a full and satisfying day.

Ubon Ratchathani's temples are among the finest in Isan. May puts you in the city for Visakha Bucha Day, the most sacred date on the Buddhist calendar. Wat Nong Bua, modeled after the Mahabodhi Temple in Bodh Gaya, is the anchor. Its central chedi rises in a stepped pyramid of carved sandstone that looks almost Khmer in the early morning light. The interior murals of the Jataka tales are detailed enough to spend an hour reading like a picture book. Wat Thung Si Mueang, in the city center, sits on an island in a small lake and feels impossibly calm for a structure surrounded by traffic. The wooden library on stilts over the water is one of the most photographed buildings in Isan, and for good reason. On Visakha Bucha evening, both temples host candlelit wien thien processions where devotees walk three times around the main chapel carrying lotus flowers, incense, and candles. The smell of melting beeswax and frangipani mingles with the low drone of chanting. The golden light reflecting off temple walls is the kind of thing that imprints. Start early, before 7 AM, to avoid the heat and have the grounds largely to yourself.

Ubon Ratchathani's food identity is inseparable from Isan's broader cuisine. But the city has its own accent. The night markets along the Mun River and around the city center come alive after 5 PM when the heat finally breaks, and the smell of charcoal-grilled kai yang, the chicken basted in a garlic-coriander-root marinade until the skin crackles, hits you from a block away. Som tum here tends to run hotter than Bangkok's version, with a heavier hand on the bird's-eye chilies and fermented fish sauce that gives it a funky, almost cheese-like depth. Sticky rice comes in small woven baskets, and tearing off a pinch to scoop up larb, the minced pork salad sharp with lime and roasted rice powder, is the foundational Isan eating gesture. The Indochina Market near the Mun River bridge has operated for decades and carries the influence of the Lao and Vietnamese communities that have shaped Ubon's palate. You will find Vietnamese-style spring rolls alongside Isan sausages, grilled Mekong fish wrapped in salt crust, and bags of dried chilies in shades from brick red to almost black. May's evening temperatures, still warm but bearable after sunset, make night market grazing the ideal way to eat.

Kaeng Tana, about 75 km (47 miles) east of the city where the Mun River narrows through a rocky gorge, is a different beast in May than in the dry months. The rapids that were exposed boulders in March now have real water pushing through them, and the roar of the Mun funneling between the rock shelves is audible from the parking area. The park is compact, manageable in a half day, and the riverside trails run through semi-deciduous forest that is greening fast in the early rains. Mushrooms push through the leaf litter after the first storms, and the air carries that particular post-rain forest smell of wet earth and decomposing leaves that dry-season visitors never experience. The rock formations along the river are smooth, water-sculpted sandstone, and sitting on them with the mist from the rapids cooling your face is one of the most physically pleasant things you can do in Ubon Ratchathani province in May. Mind you, the rocks are slippery when wet, and the river current in May is strong enough that wading beyond ankle depth is dangerous.

Sam Phan Bok is a field of 3,000 eroded rock holes carved into the Mekong riverbed, exposed when water levels drop, and it is one of the most surreal landscapes in Southeast Asia. Here is the catch with May: the Mekong is rising, and by late May the lower formations may already be underwater. If you are visiting in the first two weeks of May, you likely still have access to the main viewing areas, and the advantage is that you will have them almost entirely to yourself. The drive from Ubon Ratchathani is about 120 km (75 miles) to the northeast, and the final stretch is a rural road through rice paddies that are just starting to flood. Arrive at dawn. The rock formations catch the sunrise light in a way that turns the sandstone from grey to amber, and the only sound is the Mekong moving below. By mid-morning the heat will drive you back to the vehicle. But those first two hours are extraordinary. If you are visiting in the second half of May, check locally before making the trip. Water levels vary year to year, and there is no point driving two hours to look at a river.