This park is called as "Kujira park"; Kujira means "a whale" in Japanese. In 1961, fossils of a whale was found in the riverbed of the Tamagawa river around here. Now, here is far from see (more than 30 km), but a million years ago, this place is under the sea.
In 1945, a tragic train accident happened on the railway bridge across the Tamagawa river. Two trains had a head-on collision, and more than 100 people died. The two wheels you can see are the monument of the accident. On the board, the outline of the accident was written in Japanese.
Tama area is the name of the western part of Tokyo Metropolis. It consists of 26 cities, 3 towns and a village. A lot of people (about 4 milion) live in a eastern half part of the area. However, there are many mountains in the western part of Tama area, and there are very little flat land. Many hiking spots are in the western area, so you can enjoy walking on the trail, camping, and so on. If you see the beautiful mountain scene, you may not believe this is also in Tokyo.