An Ecuadorian woman has fallen to her death at Grand Canyon of Yellowstone National Park.

Estefania Liset Mosquera Alcivar, 21, was a park concession worker from Quito, Ecuador, and in the U.S. on a visa.

She fell into the canyon at Grandview Point at around 3.15am on Friday while socializing with co-workers near a huge drop

She was near a trail along the edge of the canyon when she plunged to her death.

Her companions saw her fall and dialed 911.

Rescuers spotted her body in the canyon at first light. They determined the fall was not survivable.

Search and rescue crews used a helicopter to recover her body later in the morning.

Yellowstone officials say the death is under investigation. 

Tributes flooded in from friends and family after officials revealed she had died.

Relative Jose Verdezoto Mosquera wrote on Facebook in Spanish: 'You have no idea how much I miss you my you. I'll always remember you as that beautiful girl and full of life.

'We lost you but heaven is so lucky to have won a beautiful and wise little angel.

'May God bless you and be always at your side. This is not a goodbye just a see you soon.'