Hi, I believe that it is either the Hudson River or the Albany River! Hope this helped!
In the excerpt of “Games at Twilight” by Anita Desai, the best line that suggests that the children have completely forgotten about Ravi is “They have quite forgotten him”. As the story goes on, the reader was let known that a lot of time has passed using the “Evening” and “Twilight”. From afternoon that they started to twilight could be along time for one round of hide and seek.
You would have to tell us what the sketches are