Nakhon Phanom is a province in northeastern Thailand, bordering Laos to the east over the Mekong River. It’s known for the huge, ornate Wat Phra That Phanom temple, a significant religious site said to contain the Buddha’s breastbone. The provincial capital, also called Nakhon Phanom, is home to several other temples, including Wat Okat Si Bua Ban, which features 2 sacred golden images of the Buddha.