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