The Mekong River forms a border between Thailand and Laos.
The two countries sharing the Jordan river as a border are 1. Israel, west of the river and 2. Jordan, east of the river.
the Prut forms the border between Romania and Moldova.
Slovakia and Hungary
Ireland
The Rio Grande forms the border between Mexico and the United States.
The Mekong River forms much of the border between Laos and Thailand. It is a major river in Southeast Asia that flows through multiple countries.
it is a river that makes part of the border between the u.s. and Canada
Rio Grande. *is from Texas*
China.
The Danube River forms the border of some countries. They are Romania, Bulgaria, Hungary, Serbia, Slovakia, Austria and Germany.
The St. Lawrence River forms part of the eastern end of the border between Canada and the United States. The St. Lawrence River is also used as a shipping channel. Ships use it to go between the Atlantic Ocean and the Great Lakes.