Shinei-cho danchi in Soka-shi 草加市, Saitama (map), is a large, apple-shaped danchi on the banks of a river. Mature cherry trees line the east side of the danchi, which looks lovely in early spring.
In the early 1960s the site comprised dozens of thin strips of farmland, likely separated by irrigation and/or drainage ditches. The complex was built before 1974/78:
This danchi came to my attention from the following tweet, which identifies the similarity between this danchi and a green apple:
Maps (photo on left from Twitter, per above):