What does area IV on the map indicate?

IV On a map mean 4!

Explanation:

The Eckert IV projection is an equal-area pseudocylindrical map projection.

Hello, it appears you're missing the map necessary in order to answer your question. Without it, I'm afraid I cannot help you answer this inquery. If you re-edit your answer to feature the map you mentioned, I would be more than happy to help you.

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