A town located on Long Island ( which is NOT part of NYC) in between the North and South Forks (and no, it's not part of the Hamptons either). Also known as River-Hood to many of its inhabitants, though it may be noted that is only ok for people from Riverhead to call it that. Otherwise it's just plain rude. It may also be called home to the best Middle School (and High School too, while we're at it) track team, the best cross country team, the best Latin program... You get the picture.
E.G: Those kids from Riverhead kicked our butts in _______ (fill in the blank here) yesterday.