Bali Nine pair's move to execution island devastating: Bishop

Foreign Minister Julie Bishop says she's dismayed that Indonesia is pressing ahead with the execution of Australians Myuran Sukumaran and Andrew Chan.

Bali's prosecutor Momock Bambang Samiarso confirmed on Tuesday evening that the pair will be transferred on Wednesday to the prison island of Nusakambangan where they will be executed.

Ms Bishop said this was devastating news.

"I am dismayed by reports that Andrew and Myuran are to be transferred by Indonesian authorities in preparation for their execution," she said in a statement.

Ms Bishop said she would continue to contact ministers in Indonesia to press for a stay of the executions.

"Given their rehabilitation, it is callous for these executions to proceed," she said.