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To reproduce the marine environment of Ariakike and Yatsushiro in Japan, The Ministry of Land, Infrastructure and Transport is dedicating much focused effort on cooperation with national and prefectural investigation-research organizations, environmental information sharing and efficiency of information gathering, offering the related information on garbage, water quality, sediment quality and etc., to coastal organizations (self-governing body, academic organization and residents). This paper will present a marine environmental information GIS system, which is developed based on ArcSDE, ArcIMS, ArcView, and Oracle database. With the help of the developed system, the web site and database query are incorporated to explore or download related information including water quality, sediment quality, plankton, benthos, etc. WebGIS and the clearinghouse, which is a part of information technique policies for Japan's government, have been viewed as essential tools to improve information sharing among coastal organizations.