It depends on which country and which river.
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The Indus River
Most of the country is either in the Vitula River basin or the Oder River one.
One river in the Dominican Republic is the Yuna River, which is actually the largest in country.
India is the world's largest country named after a river. [Indus river]
The Uruguay River and the Negro River ("Black River"). The first one is the longest (around 1,100 miles) and from where country takes its name and the second one is the one with a larger flow.
Egypt is one.
Neil Armstrong's impact was going to the moon adn being the first one on the moon.
The River Thames runs through one country; England.
Maui is one of the Hawaiian Islands.
Huang River???? I think
Egypt has the nile river which is the longest in the world