Cause its the shore in New Jersey.
Jersey Shore is the shoreline of New Jersey.
RIVER
Jersey Shore house in Seaside Heights,New Jersey
New Jersey Shore Line Railroad ended in 1914.
In the state New Jersey.
Hazlet, New Jersey
The New Jersey coast is called the Jersey Shore because it is a popular and iconic region known for its beaches, boardwalks, and attractions. The term "Jersey Shore" is believed to have originated from the historical use of the word "shore" to describe a coastal region, along with the state of New Jersey's association with it.
"On Jersey Shore" is not an idiom -- it's a description of where someone lives. They are on the shore or coast of the state of New Jersey.
You can rent a house at the jersey shore at shorevacations.com. Another good website is www.newjerseyshore.com/new-jersey-shore-rentals.php
New Jersey
Seaside Heights, New Jersey