A park in a riverbank.
Also, water flows from here through Tama River waterworks (Tamagawa-josui). Tamagawajosui was made led by Tamagawa brothers and an image of Tamagawa brothers stands here.
I draw photo out from my stock, so the tense will be upside-down. I know that my English is slightly strange, but don't mind it and send comments. Thank you for looking.