Loei (เลย) is a city in the Isaan region of Thailand.
Loei is a city surrounded by undulating mountain ranges whose fog-shrouded summits are abundant with flora. The well-known mountains are Phu Kradung, Phu Luang, and Phu Ruea. Its temperature is comfortably cool, with beautiful geographical surroundings, as well as unique cultures and traditions. In the cool season it can get decidedly chilly, one of the few parts of Thailand that ever gets down to 0 degrees Celsius.