In what is modern Isan, another Indianized kingdom, of Si Kottaboon, rose with the capital of Nakhon Phanom. The territory of Si Kottaboon covered mostly northern Isan and central Laos.
The sacred chedi of Phra Tha Phanom is famous as the oldest in the Northeastern part of Thailand. It is located in the compound of Wat Phratat Phanom Waramahawihan.