High Quality Content by WIKIPEDIA articles! Yamachiche is a municipality in the Mauricie region of the province of Quebec in Canada. The name Yamachiche was first used to identify the Little Yamachiche River (Petite rivière Yamachiche) which runs through the town. It came from the Native American (possibly Cree) words iyamitaw (meaning "much") and achichki (meaning "mud"). Therefore Yamachiche could have the general meaning of "muddy river", which is a characteristic of this stream. In Abenaki, it was identified as Namasis (small fish) and Obamasis (small white fish). In 1653, the area was part of a fief granted to Pierre Boucher de Grosbois, Governor of Trois-Rivières, and in 1672, it was formally ceded to Grosbois. The Grosbois or Machiche Seignory was 1.5 leagues long by 2 leagues deep along the shores of Lac Saint-Pierre. But because of war with the Iroquois, it could not be colonized until the beginning of the 18th century.