A plaque has been unveiled at one of Tonga's popular natural attractions to raise awareness of its importance.
Maui's rock or tsunami rock is the biggest rock in Tonga and there is speculation it could be the biggest single piece of tsunami debris in the world.
Toshihiro Nikai of Japan's Liberal Democratic Party was present at the unveiling with the Deputy Prime Minister Siaosi Sovaleni.
Tourism CEO Fekita 'Utoikamanu said Mr Nikai was honoured to be at the unveiling.
"He had a special interest in the rock because he is a staunch supporter of preparation for tsunami, so personally for him it was quite a significant event and he noted that he heard the tale about this tsunami rock, but this was his first trip to Tonga and so it was personally quite a big event for him."
Fekita 'Utoikamanu was joined by the district officer for Kala'au and the MP for Tongatapu five.