1, the United Kingdom of Great Britain and Northern Ireland.
It flows through 2 constituent countries of the UK, England and Wales.
The Seine River flows through France, though it may seem big enough to flow through many countries, it does only flow through the one and only France.
The Saigon River flows entirely within Vietnam. It originates in the Central Highlands and flows southward through various regions before emptying into the Mekong River Delta near Ho Chi Minh City. Therefore, it does not flow through any other countries.
It has its origin Cottian Alps, Italy and mouth at the Adriatic Sea with basin countries of Italy and Switzerland.
only china
The River Thames flows through 8 counties.
The Mackenzie River is one of the largest in all of Canada. It is long enough that it runs through at least 10 different towns throughout the Yukon.
1
I find no mention of a river named Mediterranean River" anywhere on the Internet There are many rivers, running through many countries, around the Mediterranean Sea.
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The Nile is known to flow through 20 different country's.
It does not flow through Kenya.
The Mississippi River flows through 10 states in the United States.