he 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]