1. The Danube is the natural frontier between the two countries. 2. To the east, the Moselle River forms a natural frontier with Germany. 3. The Amanus is a natural frontier : west is Cilicia, east is Syria. 4. Within the Sierra Morena, the gorge of Despe�aperros forms a natural frontier between Castile and Andalusia. 5. Thus, the area in Southern Leyte is the natural frontier of historically significant events in Philippine history. 6. The Aegean Sea was a natural frontier for a state based in Babylonia, as Xerxes discovered long ago. 7. Napoleon would remain as Emperor of France, but it would be reduced to its " natural frontiers ". 8. Lacking its natural frontier and having lost its costly system of border fortification, the new state was militarily indefensible. 9. :* In Dominant themes, the natural frontiers are now explained in the context of " modern" 10. It thought the area was a natural expansion of the Viedma colony, and the Andes were the natural frontier to Chile.
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