Sao Din Na Noi
Locally called "Hom Jom" this natural geological occurrence from soil erosion is located about 6km from Na Noi in Nan province. It is a bit difficult to find as following Thai tradition the signs at the last few km are missing. But worth the extra 6 km side-trip to see this extraordinary and intriguing moon-like landscape of eroded sand pillars and cliffs made by wind & rain. Although it is also said to be made by the sea about 10.000 - 30.000 years ago. I would go for wind & rain. There is an information center with toilets but there is no coffee shop / restaurant or shop for food. So take your own drink and food with you, buy in the village or the 7/11 at the PTT Gasoline station.