It happened in the 2700 block of Klockner Road in Hamilton Township.
Police say a 15-year-old boy had to be rescued after he fell down a ravine.
Rescuers used a rope to help get him out.
He was rushed to Robert Wood Johnson Hospital for treatment of an injured ankle.
Officials say the boy was not sledding in an area where most other people were sledding.
Meanwhile, another sledding accident took place in Bear, Delaware.
New Castle County paramedics responded to the Glasgow Park in the 2100 block of Pulaski Highway for the report of an injured girl. At that location they found that a 15-year-old had been struck by another sledder at the bottom of a hill.
The girl was knocked to the ground and sustained a head injury.
New Castle County paramedics treated her during transport to Christiana Hospital. She was admitted to that facility in stable condition.
A second injured person was also transported to Christiana Hospital.
