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lake; marsh; wetland; inland waters
この地域には多くの湖沼が点在する。
Many lakes and marshes are scattered across this area.
湖沼の水質調査が定期的に行われる。
Water quality surveys of lakes and wetlands are conducted regularly.
湖沼の生態系を保全する取り組みが進む。
Efforts to conserve lake and marsh ecosystems are advancing.