However , Vanuavatu is the seat of Tui Vanua who answers directly to the Roko Sau .
Traditionally the High Chief of Totoya district , Roko Sau has dominion over Vanuavatu island and its people .
Vanuavatu is the seat of Tui Vanua who answers directly to the Roko Sau .
Traditionally the High Chief of Totoya district , Roko Sau has dominion over Vanuavatu island and its people .