Mikawa (三河国; -no kuni) is an old province in the area that today forms the eastern half of Aichi prefecture. Mikawa bordered on Owari, Mino, Shinano, and Totomi provinces.
Even today, Mikawa is used to refer to the eastern portion of Aichi, including such cities as Toyohashi, Okazaki, and Toyota.
The article is originally from OpenHistory.