Ireland Brook is a moderately long stream that drains an area in central East Brunswick.

It crosses Fern Road, then runs through the East Brunswick Community Park and the Ireland Brook County Park.

Crossing Dunhams Corner Road and the New Jersey Turnpike, it continues running through the long Ireland Brook County Park.

It crosses Fresh Ponds Road and Riva Avenue, and drains into the Farrington Lake, a dammed section of the Lawrence Brook, at 40°25′14″N 74°29′07″W / 40.42056°N 74.48528°W / 40.42056; -74.48528.

[1] This stream runs through a park, where it is easily accessible for about half of its distance.