Map of reclaimed land in Tokyo, colored by decade (1910s thru 1990s):

Source: Future Visions of Tokyo that Mattered: How utopian concepts shape urban outcomes

And the shaded areas in the following map, which is referenced in the following post: Walking on water: the underground rivers of Tokyo 東京の地下河川や運河の地図

The most interesting example of man made land in Tokyo are the daiba (defensive islands) built to protect against mid-19th century foreign visitors. Read more at: