A peninsula is a landform that extends from a mainland and is surrounded by water on most sides. Peninsulas exist on all continents. The largest peninsula in the world is the Arabian Peninsula.

New Barbadoes Neck is the name given in the colonial era for the peninsula in northeastern New Jersey, US between the lower Hackensack and Passaic Rivers, in what is now western Hudson County and southern Bergen County. The neck begins in the south at Kearny Point in the Newark Bay and is characterized by a ridge along the west and part of the New Jersey Meadowlands on the east.