After came back from Wang Ta Krai Waterfall, Nakhon Nayok, Thailand. I found that things under creek beds were also intersteting, apart from beaches and canals. The water was running dry in summer. The oval-round small rocks appear and you can find treasures under the rocks. They are mostly coins and silver rings. I have not found gold rings, anyway. I was told by a security guard that some of treasure hunters came down here a couple times. They searched greedily under the water bed. Some of them destroy the water way by changing the position of the huge stones in the middle of the stream. Sad, isn't it? They just want get what they want without any cares.
I cleaned my finds but some of them are still dirty. Anyway, they are just for my memory.