|John Randel, surveyor, drew the map for the City's|
There is a terrific interactive street map from 1811.
If you look carefully you will see that the Spurten Duyvil Creek (over which the Henry Hudson Bridge now passes) leads into the tidal basin (now Inwood Hill Park and Columbia boathouse) and then heads back north over a kind of thumb. That "thumb" is now Van Cortland Park. It was cut off by the ship canal which joined the Spuyten Duyvil and Harlem Creeks. So part of Manhattan Borough is "in" the Bronx.