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The Mekong River forms a border between Thailand and Laos.
the Prut forms the border between Romania and Moldova.
Slovakia and Hungary
The Danube River forms the border of some countries. They are Romania, Bulgaria, Hungary, Serbia, Slovakia, Austria and Germany.
There are two countries that form the borders of the United States: Canada and Mexico. Canada forms the northern border of the United States and Mexico forms the Southern border of the United States.
The Rio Grande forms the border between Mexico and the United States.
The Rhine rises in Switzerland and also flows through Liechtenstein, Austria (it forms the border with Switzerland), Germany, France (where it forms the border with Germany) and the Netherlands.
Jordan shares borders with a few other countries. The countries that border Jordan are Syria, Israel, Iraq, and Saudi Arabia.
The Rhine rises in Switzerland and also flows through Liechtenstein, Austria (it forms the border with Switzerland), Germany, France (where it forms the border with Germany) and the Netherlands.
Russia forms much of China's northern border. The two countries share a long boundary in the north, primarily in the regions of Siberia and Manchuria.
Niger Nigeria Cameroon Chad
The Jordan river forms a border between Jordan and Israel.