"I live in New York, and I was thinking about the lagoon in Central Park"

The Central Park Lagoon (or pond) is a key feature of the park, intended as a quiet, welcoming place for those entering from the southeast corner.  Holden returns to the problem of the ducks throughout the book.

Here's the lagoon in the summer (looking north).  No ducks in sight, however. 

 

Central Park Lagoon
Creative Commons Attribution Share AlikeCentral Park Lagoon - Credit: David Shankbone

And looking south...  still no ducks.

 

Central Park Lagoon, looking south
Creative Commons Attribution Share AlikeCentral Park Lagoon, looking south - Credit: Ahodges7