A 23-year-old woman who was out for a hike with friends in an Ontario park died Sunday night after falling from a cliff.

Halton regional police said the incident took place at Rattlesnake Point in Milton.

One of the woman's friends called 911 shortly after 9 p.m. after the woman fell more than 20 metres from a trail, police said.

Sgt. Barry Malciw said police officers, firefighters and paramedics rushed to the area to help, but paramedics weren't able to resuscitate the woman when they found her.

She was pronounced dead at the scene, Malciw said.

"At this point we don't believe this to be suspicious," Malciw said, adding the police investigation is ongoing.

The area on the Niagara Escarpment is popular with hikers, bikers, rock climbers and campers, and includes more than 13 kilometres of trails, said Norm Miller, a spokesperson with Conservation Halton.

There are some fences and protective barriers in the park, Miller said, but not all areas are near a cliff.

This isn't the first time someone has had a bad fall in the park, police said.

In April, a 41-year-old rock climber had to be airlifted to hospital after suffering serious injuries when he slipped from a cliff face and fell 15 metres to the ground.

At a neighbouring park, also run by Conservation Halton, a 35-year-old Toronto firefighter died after falling 18 metres from a cliff.

Sara Rosen was cycling with a friend when she fell down an escarpment at Kelso Conservation Area last May. She was pronounced dead at the scene.