This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Lake Biwa Canal inYoshi pf. Cross section Tunnel No of Lake Biwa Canal completed in In the progress and on the completion cite book Biwako Sosui shi or Lake Biwa Canal Summary part of the third plate following Ky toshi Sanjikai Japanese cite book PDold Biwako Canal Lake Biwa Cross sections of tunnels Tunnels in Japan