If I'm understanding what корневая часть (полуострова) means, then it would be: An isthmus (pronounced /ˈɪsθməs/ or /ˈɪsməs/; plural: isthmuses, isthmi, from Ancient Greek: ἰσθμός isthmos "neck") is a narrow strip of land connecting two larger land areas usually with waterforms on either side.[1] Of note, the Isthmus of Corinth connects the peninsula of Peloponnese with the rest of the Greek peninsula, the Isthmus of Panama connects the continents of North and South America (the Americas), and the Isthmus of Suez in Egypt connects Africa and Asia (or Eurasia).
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