Mayor Hamish McDouall will visit Whanganui's Japanese sister city of Nagaizumi in August to celebrate 30 years of friendship.
The 30th anniversary ceremony will coincide with the Waku Waku Festival in the city which is all about fun and excitement.
Whanganui District Council is a member of Sister Cities New Zealand, a national body which fosters international understanding and friendship and encourages and promotes exchanges and tourism and trade for economic growth.
Nagaizumi in Shizuoka was chosen as a sister city because of its demographic similarities to Whanganui, its rural nature and the opportunity for mutual opportunities.
"This significant celebration allows us to be positive ambassadors for Whanganui, to promote our district and to recognise the relationship's cultural, educational and economic benefits and investment," Mr McDouall said.