At present, Fukushima Prefecture is the most affected place by nuclear radiation in Japan, followed by Chiba Prefecture, Tochigi Prefecture, Ibaraki Prefecture, Miyagi Prefecture, Yamagata Prefecture, Niigata Prefecture, Nagano Prefecture, Yamanashi Prefecture, Saitama Prefecture, Tokyo and Gunma Prefecture.

In 20 1 1 year of the incident, the World Health Organization concluded that the incident would not affect the food produced in other countries, let alone cause health problems to people who eat these foods. In March, 20 1 1, the US Food and Drug Administration announced that it would stop importing dairy products, fruits and vegetables, rice, grains, meat, poultry, seafood, etc. produced in many irradiated areas in Japan (such as Fukushima, Tochigi, Gunma and Ibaraki).

Topography of Tokyo:

The east-west width of Tokyo in Honshu is about 85 kilometers, and the north-south length is about 25 kilometers. In the fifty-seventh year of Showa (1982), the land area of Tokyo was 39.2% mountainous, 7.6% hilly, 29. 1% terrace, 12.7% lowland,11. In terms of land use, in the 12th year of Heisei (2000), 35.8% of the land in Tokyo is forest, 0.2% is paddy field, 3.9% is dry field, 48.8% is street land, and 1 1.3% is other land.

From east to west, the topography of Tokyo and Tama can be roughly divided into four parts: Nakagawa Lowland, Musashino Terrace, Tama Hill and Kanto Mountain. Nakagawa Lowland is located between Musashino Platform and Lower General Platform, including the eastern part of Tokyo. It is formed by the alluvial of Tonegawa's distributary rivers such as Edogawa and Arakawa. In Edogawa, jiangdong district and other places, there are large areas with altitude below 0 meters.

Reference to the above content: Baidu Encyclopedia-Tokyo