Britain's King Charles will be offered the title of high chief in Samoa in a three-day visit starting Wednesday and will be shown the impact of rising sea levels due to climate change in the Pacific island nation.

King Charles and Queen Camilla have left Australia for Samoa where the British monarch will address a Commonwealth summit and be given the title of high chief. The couple are expected to be greeted by hundreds of people in the Pacific island nation which is holding its first Commonwealth Heads of Government Meeting in capital Apia this week.