Watu Ongko inscription is located in Ngancar village, District Plaosan. This Watu Ongko Inscription as part of Waterfall tourism object area that developed by Magetan regency government.

Watu Ongko has its own meaning; Watu means rock, and Ongko means number . This sanscript is the heritage of Majapahit Kingdom. This is a written stone and an old grave that is cared by the society and used for ritual ceremony. It is located in return line from the other waterfall. It is an inscription that still taken cares by the local society and has became the ritual place in a certain time.