The “Overseas Seminar on Marine Spatial Planning Technology and Blue Economic Development for Pacific Island Countries” was co-hosted by the Pacific Islands Development Forum (CIDP) Blue Economy Unit, China Oceanic Development Foundation (CODF) and the Fujian Institute of Oceanography (FJIO) from August 14th, 2023 to September 4th, 2023. The seminar was delivered first in three CIDP member countries, namely Tonga, Vanuatu and Fiji.