The province is covered with mountains, such as Phu Kradueng and Phu Ruea, while the capital Loei is in a fertile basin. The Loei River, which flows through the province, is a tributary of the Mekong, which forms part of the northern boundary of the province with neighboring Laos. Phu Thap Buek, the highest mountain of the Phetchabun Range, is in the province.[1]
The city of Loei is surrounded by mountain ranges whose summits are covered by fog and are abundant with various kinds of flora. The best known mountains in the province are Phu Kradueng, Phu Luang, and Phu Ruea.