The arrow labeled with the number 1 on the map above is pointing to the Sea.

North Sea

Explanation:

The arrow labeled 1 on the attached map is the North Sea. This sea exists between the United Kingdom, Norway, Germany, Belgium and the Netherlands.

The North Sea contributes significantly to the economies of these countries as it is a major source of resources such as fish and fossil fuels. It is also useful for wind energy and sees a lot of tourists visiting its shores.

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if im wrong correct me but have a blessed day!