The 'Holy Reliquary in the Middle of the River' (sometimes called Phra That Nong Khai) is a ruined Lao-style chedi submerged in the middle of the river that can only be seen in the dry season when the water is low: the river rises and falls about 13m annually. The chedi was gobbled up by the meandering Mekong in the middle of the 18th century and it toppled over in 1847. It's still holy and when it's exposed, people attach coloured flags to it. Phra That La Nong , a replica erected on land, glows brightly at night.
