Cris and I stumbled on this place 25 years ago. Obviously it’s still there. The location is here: [Google map]
賽の河原 (Sainokawara)
The Sainokawara in Sado, Niigata is a limbo for dead children, at least according to Buddhist mythology. It lies in the middle of the Ono-game and the Futatsu-game. It is a spooky place located at the entrance of a cave right on the coastline and is dotted with small statues and dolls.