The eastern boundary of the Yanan territory is formed by a range of mountains a little west of Lassen Butte and terminating near Pit River; the northern boundary by a line running from northeast to southwest, passing near the northern side of Round Mountain, 3 miles from Pit River. The western boundary from Redding southward is on an average 10 miles to the east of the Sacramento. North of Redding it averages double that distance or about 20 miles.