Final answer:
An isthmus links two landmasses while a strait separates them, allowing ship passage. Baymouth bars form at bay entrances due to sediment transport.
Explanation:
Isthmus: A narrow strip of land with sea on either side, connecting two larger landmasses. An example is the Isthmus of Panama.
Strait: A narrow passage of water separating two large landmasses, allowing for the passage of ships. For instance, the Strait of Gibraltar connects the Mediterranean Sea to the Atlantic Ocean.
Baymouth bar: A spit extending across a bay, almost closing it off. It is formed by sediment transport, creating unique coastal features.
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