This is a sacred stupa and reportedly the burial site for one of Buddha’s bones. It is an important place for Buddhists and is registered as a National Treasure of Lao PDR. It was built about 450 years ago by the King Marukhanakhone to commemorate the Buddha's visit to the site in the past. Buddha is believed to have delivered a sermon to people at the site and later took a rest under the “Hang” tree. This is the reason why the stupa is called That Ing Hang. the annual festival is held every November (exact date varies according to the lunar calendar.See event and festival page). That Ing Hang is located in Ban that("That village"). The easiest way to get there is to head out along Route 9 for about 12km and lelt by a police box, and then drive straight for about another 3km and you will come directly to That Ing Hang. There is a slightly shorter way along back-roads and this is sign-posted from the outskirts of Savannakhet.

Women are required to wear a traditional Sin (Lao Skirt) in order to enter the site. These are available next to the entrance. You need to pay for entry fee , its open daily from 8 a.m to 6 p.m.