The United States and Mexico.
the colorado river runs through North America
The Arkansas River (It also flows through Oklahoma).
It flows though seven states of the USA they include:ArizonaColoradoNevadaCaliforniaNew MexicoUtahWyoming
Yes, the Colorado River runs through Arizona. if you go on http://alliance.la.asu.edu/maps/AZPHYSICAL.PDF, you can see the Colorado River on this map.
The Colorado River.
The Black River is in the United States, it runs through no other countries.
Canada
Russia
Venezuela
Romania.
SPAIN !