An advantage of using a river as boundary is that its creates a clear line which made the boundary very solid and indisputable.
What is a boundary?
A boundary means a land location that differentiate the extent of the territory of two or more country, state, city, town etc
Some region were able to use river as boundary because of its presence whereas some region without river may use a structure to show the boundary.
Hence, the advantage of using a river as boundary is that iys creates a clear and visible separate line which made them solid and indisputable.
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