Lake Shinji/Nakaumi

Lake Shinji and Lake Nakaumi


Research Center for Coastal Lagoon Environments, Shimane University

Research Theme

  • Unraveling the mechanism of environmental change in brackish-water zones in relation to the complex systems of nature and mankind
  • Developing a new model for the wise use of brackish-water environments

The Organization of the research center consists of two sections: Diversity Research and Environmental Change Research. The research themes are following, respectively:

Diversity Research Section :

  • Surveying the fauna and flora in coastal lagoons and estuarine zones
  • Creating biological wealth by restoring the degraded environments
  • Promoting sustainable development
  • Restoring natural wetlands

Environmental Change Research Section :

  • Observation and analysis of the ongoing processes of environmental change
  • Understanding the processes and mechanisms of preservation of environmental information in bottom sediments, with an emphasis on hydrocarbon accumulation related to global environmental change
  • Decoding and analysis of long-term environmental change, based on the records contained in bottom sediments

Site Outline

The estuarine lagoons, Lakes Shinji and Nakaumi, are located along the Japan Sea coast in the San-in district, southwestern part of Japan. Lake Nakaumi, connected to the Japan Sea (Miho Bay) through the Sakai Channel (7.5 km long), has a surface area of 86.2km2 and a mean depth of 5.4 m. It develops a halocline and salinity of the upper layer is c. 1/3 of the seawater, whereas the lower layer is closer to that of seawater. Lake Shinji (79.1km2 in surface area and 4.5 m in mean depth) is connected with Lake Nakaumi through the Ohashi River (c. 7 km long), and freshwater is supplied from the Hii River at the western part of the lake, and only a thin layer of saline water is sometimes observed on the bottom. Salinity of this lake varies widely from c. 1 PSU to 10 PSU. In Lake Shinji, there is a dense population and active fishery for the filter-feeding bivalve Corbicula japonica. In Lake Nakaumi, a dense population of another filter-feeding bivalve, Musclista senhousia, is found in the shallow area.


  • Address : 1060 Nishikawatsucho, Matsue 690-8504, Japan
  • Name : Hidenobu Kunii
  • Phone : 0852-32-6439
  • Fax : 0852-32-6439
  • E-mail :

WWW site URL


(日本語) JaLTER Open Science Meetingのお誘い

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