Relatives of two Australian death row prisoners have made their first visit to the Indonesian prison island where the convicted drug traffickers are to be executed by firing squads.

The two, Andrew Chan and Myuran Sukumaran, were flown Wednesday from the resort island of Bali to the Nusakambangan Island prison off Indonesia's main island of Java. They are among nine foreigners and an Indonesian the government says will be executed soon.

Chan's brother Michael told reporters he was looking forward to hugging his younger brother before the families took a ferry to the prison island on Monday from the port of Cilacap.

Authorities are waiting for all legal appeals to be exhausted before setting execution dates.

Chan and Sukumaran will take their plea for clemency to an administrative court Thursday.