Where can I get geographical map of the world with 3000 to 20000 years old land and sea level data?

I own a book called "Underworld: The Mysterious Origins of Civilisation" By Graham Hancock.

Its a physical and intellectual journey, a worldwide exploration diving for the underwater ruins of a lost civilization, this book follows clues in ancient scriptures and mythlogy and in the scientific evidence of the flood that swept the Earth at the end of the last Ice Age. It explores the question of early humans swept away by the catastrophe. The text is written as a personal adventure involving the reader in the travels. I simply LOVE this book.

Hancock's book has many many geographical maps of the ancient land mass and continents, and simply astounding sea- level data. Please do try this book. Maybe at the library or a book shop.

Read more about it -

http://www.grahamhancock.com/underworld/

I don't think any organisation is creating such a map. The time range is too much in the past to reconstruct with the help of historical data. If a sea has regressed, you may get some quaternary sediments to tell you about the geological history of the coastline. But, if the sea has transgressed, all the evidence will be submerged and destroyed by the wave action. The time you have suggested is not long enough to form even a semi-consolidated rock.

Therefore, I suggest you to reconstruct it with the help of history books (or from archaeological data) where old civilisations were in existence and also with the help of quaternary data wherever available. But it is a mammoth task and even then a large part will remain incomplete. Still, If you can do it, it will be an asset to all future earth scientists. Best of luck.

Lastly, the present day data on rising or lowering sea levels would not help, as such rates vary constantly and cannot be used as indicators of past occurrences.

Map making was crude back then at best and people didn't worry about sea level or elevation.

u can't get it anywhere