Kishimen is a local specialty of Nagoya, the fourth largest city in Japan. Also is a specialty of Aichi prefecture which Nagoya is the prefectural capital.
Kishimen looks similar to udon but if is a flat noodle and not chewy at all. The definitions of kishimen are:
1 - the width must be 4.5 mm or more
2 - the thickness must be less than 2.0 mm
Kishimen can be eaten everywhere in Aichi prefecture but the most famous kishimen diner is located on the platform of Tokaido Shinkansen at Nagoya station.
As same as udon or soba noodles, there are many toppings to be added on the top of the noodle soup. Also cold kishimen exists without the soup.