The Danube
The partition between Serbia and Romania is the Iron gate gorge or canyon. The gorge is part of the middle section on the Danube river.
There is no geographical feature that forms the border between Portugal and Spain. The Strait of Gibraltar and Mediterranean Sea separates Iberian Spain and Morocco. The Pyrenees Mountains forms the border between Spain and France and Spain and Andorra.
The tweed
The 42nd parallel forms the southern boundary of Idaho. It marks the border between Idaho and Nevada as well as a portion of the border between Idaho and Oregon.
the yalu river
the Prut forms the border between Romania and Moldova.
This river is called Danube. Its a northern border to Bulgaria and for Romania the south bound.
The partition between Serbia and Romania is the Iron gate gorge or canyon. The gorge is part of the middle section on the Danube river.
At last its h2o
This is the river Danube.
This is the Black Sea.
This river is Danube.
Daniube (in German Donau) in Bulgarian DUNAV
You think of course to Danube river.
This boundary is mainly Danube; and a in the South of Dobrogea a terrestrial border.
The Limpopo forms that border between Zimbabwe and South Africa.
The Colorado River forms the border between Arizona and California