| 21. | Researchers focused on a structure called the isthmus of the corpus callosum.
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| 22. | The storm crossed most of the Central American isthmus overnight.
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| 23. | Finland lost the Karelian Isthmus to the Soviet Union after the war.
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| 24. | The western shore, Karelian Isthmus, became part of Leningrad Oblast.
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| 25. | Before the Central American isthmus formed, the region had been underwater.
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| 26. | Today the connection is formed by a narrow sandy isthmus.
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| 27. | The properly called Terra Firma was the Isthmus of Darien.
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| 28. | The rest of the isthmus was historically a part of Finnish Karelia.
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| 29. | Many Saint Petersburg residents also decamp to the Isthmus during their vacations.
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| 30. | The Karelian Isthmus lies within the ecoregion of Scandinavian and Russian taiga.
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