The territory of the Copehan family is bounded on the north by Mount
Shasta and the territory of the Sastean and Lutuamian families, on the
east by the territory of the Palaihnihan, Yanan, and Pujunan families,
and on the south by the bays of San Pablo and Suisun and the lower
waters of the Sacramento.
The eastern boundary of the territory begins about 5 miles east of Mount
Shasta, crosses Pit River a little east of Squaw Creek, and reaches to
within 10 miles of the eastern bank of the Sacramento at Redding. From
Redding to Chico Creek the boundary is about 10 miles east of the
Sacramento. From Chico downward the Pujunan family encroaches till at
the mouth of Feather River it occupies the eastern bank of the
Sacramento. The western boundary of the Copehan family begins at the
northernmost point of San Pablo Bay, trends to the northwest in a
somewhat irregular line till it reaches John’s Peak, from which point it
follows the Coast Range to the tipper waters of Cottonwood Creek, whence
it deflects to the west, crossing the headwaters of the Trinity and
ending at the southern boundary of the Sastean family.