Answer:
A narrow strip of land with sea on either side, forming a link between two larger areas of land.
Or:
A narrow organ, passage, or piece of tissue connecting two larger parts.
Plural Noun:
Isthmi
Sentences:
1. They had to travel over the isthmus to the other end of the island.
2. An isthmus led the stranded people to the inhabited end of the island.
3. As we neared the neighboring islands, we could see the isthmus from the boat deck.
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