Sinck Sinck is a historical site located in the Bronx, New York City. It was originally a small island in the East River and served as a place for the detention of prisoners during the 19th century. The name "Sinck Sinck" is derived from the Dutch term meaning "sink" or "to sink," reflecting its geographical features. Today, Sinck Sinck is part of the Riverdale neighborhood and is known for its natural beauty and recreational opportunities. The area is surrounded by parks and offers scenic views of the river, making it a popular spot for locals and visitors alike.