Laurentian, or St. Lawrence Iroquoian, was an Iroquoian language spoken until the late 16th century along the shores of the Saint Lawrence River in present-day Quebec and Ontario, Canada. It is believed to have disappeared with the extinction of the St. Lawrence Iroquoians, likely as a result of warfare by the more powerful Mohawk from the Haudenosaunee or Iroquois Confederacy to the south, in present-day New York state of the United States.