State media reported Wednesday that the "Pathein Thu" sank the previous day as it was about to dock at a jetty near the town of Ngapudaw. It had sailed from Pathein on the Pathein River about 85 miles due west of Yangon.
The reports said six people were hospitalized.
The cause of the accident was being investigated.
Boat travel is often used in Myanmar's vast river deltas and coastal regions inaccessible by roads, and accidents are common. Source