Photos of the beautiful karstic region South of Loei (Thailand)
This area on the along road 201, about 200km South-West of Nong Khai in North-East Thailand.
The area called "Wonder Cave" is about 10-20 km North of Phu Kradung National Park (there is a sign on the road).
The region known as "Stone Maze" is just west of Wang Saphung, on road 2016.
None of these places are mentioned on the Lonely Planet Guide of Thailand.