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1. Thailand: The Nan River is a major river in northern Thailand, flowing through the provinces of Phitsanulok, Sukhothai, Uttaradit, Phichit, and Nakhon Sawan. It is a tributary of the Chao Phraya River.
2. Laos: The Nan River also flows into Laos, where it is known as the Nam rom.
3. Vietnam: The Nan River flows into Vietnam, where it is known as the Gam River.
4. Cambodia: The Nan River flows into Cambodia, where it is known as the Kong River.