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Option 1: A bay is a body of water that is partially enclosed by land, with a wide opening to the sea. It is not separated by a narrow strip from the main sea, and therefore doesn`t fit the description given in the question.
Option 2: An isthmus is a narrow strip of land with water on either side, connecting two larger land masses. It is not a body of water, so it doesn`t meet the criteria mentioned in the question.
Option 3: A lagoon is a stretch of sea water that is partly or fully separated from the main sea by a narrow strip of land, such as a barrier island, sandbar, or coral reef. This option correctly describes the situation mentioned in the question and is the correct answer.
Option 4: A strait is a narrow passage of water that connects two larger bodies of water. It doesn`t fit the description of being separated by a narrow strip from the main sea, so it is not the correct answer.
In conclusion, the correct answer is option 3 - Lagoon.