The Mekong River forms a border between Thailand and Laos.
The Ohio River is the southern boundary of Ohio and Indiana.
The Ohio River forms the southern boundaries of Ohio and Indiana. It begins at the Ohio-Pennsylvania border. It flows southwesterly between Ohio and Kentucky, Indiana and Kentucky, and continues to the Mississippi River.
Slovakia and Hungary
There are many rivers that create state boundaries in the United States. The river that separates Washington from Oregon is the Columbia River.
the Prut forms the border between Romania and Moldova.
The Danube River forms part of the boundary between Bulgaria and Romania.
The TAKUKU river forms a border between the Rupununi savannahs in Guyana and Bom Fin in Brazil - thus between Guyana and Brazil.
The Jordan river forms a border between Jordan and Israel.
The Rio Grande
the river that forms the border between India and Kentucky is the Mississippi River.
The Ohio River forms the boundary between Indiana and Kentucky.