Iwachi, Shizuoka

 is an administrative part of the town of Matsuzaki, Shizuoka Prefecture, on the west coast of Izu Peninsula, Japan. It has been dubbed the "Izu Côte d'Azur" or "Japanese Côte d'Azur" for its scenic shoreline and the orange roofs of many of its houses.
Iwachi is known for its beach and "onsen" hot springs.