26-Nov-2005 -- As first visitor explained, this is an symbolic confluence in Japan, so it is one of tourist attraction. There is a park called "Japanese Navel Park" and the museum named "Nishiwaki Earth Science Museum/Terra Dome".

The biggest confluence monument in Japan was built in April　1994. There is a marker stone at the centre of the monument and is exactly measured by the government.

As you may know, we have another monument based on Tokyo Datum (Japanese local coordinate system, generally used in 20 century).