What a cool photo. It really shows how much natural scenery there still is in Tokyo despite all of the tall buildings. I can't tell if this is/was a really shallow river that's currently mostly dry or if it's a drainage system? Either way it creates a really nice looking "river" of greenery. It's awesome the cherry blossoms are still blooming like this in a few places in Tokyo, all the one near where I live already turned green? Still very pretty, just in a different way I suppose. I went for a walk today during lunch and saw a couple nice trees that still had their petals, unfortunately it was about 20 minutes from where I live walking lol.