| The confluence of the two rivers also stands as a natural boundary separating three countries Mozambique, Zambia and Zimbabwe. |
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| A spectacular beach with a nudist area marked by the natural boundary of a small, rocky barrier which stretches out into the water. |
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| Originally it had a more natural boundary to the north formed by the Upware Ridge, but a strip between the Ridge and the Fen was reclaimed in the 19th century. |
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| The rear garden is dotted with mature spruce trees and frames a view of the meandering Derry river, which provides a natural boundary for the property. |
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| Nevertheless, because the Rhine had been the boundary of Gaul for a time, it resulted in later claims by France, esteeming itself the successor to Gaul, to the Rhine as its natural boundary. |
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| The northern coniferous forest zone begins north of the natural boundary of the oak. |
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| The river forms a natural boundary between the two countries. |
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