A Canadian backpacker died from drowning after she was attacked by dingoes on a popular Australian beach, a coroner has found.

The body of Piper James, 19, was found in the early morning on 19 January surrounded by about ten dingoes on K'Gari (formerly known as Fraser Island), off the eastern coast of Queensland.

"Piper died as a result of drowning in the setting of multiple injuries, due to, or as a consequence of a dingo attack," the state's coroners court said on Friday, with investigations into her death ongoing.

At least six of the about ten dingoes that were found circling James's body were later euthanised. About 200 dingoes live on K'Gari and are protected as a native species by law.

Earlier investigations had found "extensive post-mortem dingo bite marks" and that it was "not likely" that pre-mortem dingo bites had caused "immediate death".