Datdawtaung Cave (aka Dattaw Taung Gu) is in Mandalay Division. There are quite a few photos of the cave chamber on the internet, but I don't know anything about the cave. It is located in Mya Leik Taung hill. This blog says it is near the town of Kyauk Sel. Photos show a chamber with some large stal and a central large stalagmite with Buddha images.
Ref: BHB 39.