The Mekong River forms a border between Thailand and Laos.
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Mekong
The river sperating Thailand and Laos is the Mekong River
The Mekong River forms the border between Laos, Thailand, and Myanmar. Technically, it does not flow through Laos; it does, however, border or touch Laos.
The Mekong River
The Uruguay River forms the western border of Uraguay with Argentina.
The Mississippi River forms the western border of Illinois.
The Mississippi river forms the western border of the southern colonies.
The Uruguay River forms the western border of Uraguay with Argentina.
Minnesota only forms a border for one country: Canada.