Before the arrival of European colonists on the eastern shore of New England, the area around Massachusetts Bay was the territory of several Algonquian-speaking peoples, including the Massachusetts, Nausets, and Wampanoags. The Pennacooks occupied the Merrimack River valley to the north, and the Nipmucs, Pocumtucs, and Mahicans occupied the western lands of Massachusetts, although some of those tribes were under tribute to the Mohawks, who were expanding aggressively from upstate New York. The total Indigenous population in 1620 has been estimated to be 7,000. This number was significantly larger as late as 1616; in later years, contemporaneous chroniclers interviewed Indigenous people who described a major pestilence which killed as many as two-thirds of the population. The land-use patterns of the Indigenous people included plots cleared for agricultural purposes and woodland territories for hunting game. Land divisions among the tribes were well understood.