American experts say most beaches on Hawaii's most visited islands are disappearing.
The U.S. Geological Survey says a study released this week shows that 70 percent of beaches on Maui, Kaua'i and Oahu are going through long-term erosion.
The study's lead author says he hopes it will help guide developers and local officials as they consider development along the shoreline.
Dr Chip Fletcher of the University of Hawaii says the study looked at more than 12,000 locations.
Beaches are the top attraction for the more than 7 million annual visitors to Hawaii.
Tourists spent nearly 13 billion US dollars in the state last year.