The next conflict is to the north of this, where Kroeber's boundary runs up the ridge separating the Mad River from the South Fork of the Trinity, whereas Merriam's runs along South Fork itself in the twenty miles from Yolla Bolly Mountain northwest to Ruth. Essene (1942) agrees with Merriam on this point, but his data add nothing to the argument, since he worked with the same Lassik informant as Merriam. I have accepted Kroeber's version because it is corroborated by both Goddard (1907) and Du Bois (1935, map 1), who agree in assigning the valley of the South Fork of the Trinity to the Wintun. Kroeber and Merriam agree on the line running north of Ruth as far as a point about fifteen miles south of Grouse Creek, where Merriam's line drifts westward to follow the north-south channel of Grouse Creek for a short distance, whereas Kroeber's line follows due north along the drainage pattern. Essene supports Kroeber, but his informant did not come from this region so her testimony perhaps cannot be relied on heavily. I have accepted Kroeber's line because it follows the drainage pattern. Kroeber's boundary also conflicts with Merriam's on the east side of South Fork. Kroeber's line runs along the ridge separating South Fork from the main Trinity whereas Merriam's runs along the Trinity itself. The testimony of Dixon on the Chimariko (1910, pp. 295-296) supports Kroeber, so I have accepted the latter's line. The northern boundary of the Athabascans runs west, parallel to Mill Creek, crossing the Trinity a few miles south of its confluence with the Klamath, and then continues west until it reaches Bald Hills Ridge, which separates Redwood Creek drainage from Klamath River drainage. It continues north along this ridge and then turns east to cross Redwood Creek about ten miles southeast of Orick. Goddard (1914_a_, pl. 38) indicates three Athabascan summer camps on the Yurok side of the dividing ridge. This may mean that some Athabascan territory was included in the Klamath drainage, but if so, it would contradict the testimony of the Yurok (Kroeber, 1925_a_, fig. 1; Waterman, 1920, map 2). However, the land away from the Klamath was little used by the Yurok (Kroeber, 1925_a_, p. 8), so it may be that this territory was claimed by both groups. I have accepted Kroeber's boundary here. Otherwise there are no conflicts on the northern boundary. The western boundary of the Athabascans runs due south from Redwood Creek, following the 124th Meridian, crossing the North Fork of the Mad River at Blue Lake and crossing the main Mad River a few miles above the mouth of North Fork. From here the line follows south around the drainage of Humboldt Bay until it crosses the Eel River at the mouth of the Van Duzen, whence it runs south to Bear River Ridge, which it follows west to the ocean.