Southward it was Ephraim's, and northward it was Manasseh's, and the sea was its border; and they joined together in Asher on the north, and in Issachar on the east.
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George Leo Haydock
East. These two tribes are contiguous to the tribe of Joseph, taken all together, ver. 14. (Menochius)
Aser extended as far as Mount Carmel, which was not far from Dor, a city of Manasses, ver. 11., chap. xix. 26. The tribes of Issachar and of Zabulon seem, indeed, to come between Manasses and Aser; so that we might say, that the tribe of Joseph finding itself too much straitened, was forced to seek for more room in the cities of the other tribes, which we find it really inhabited, ver. 11. We might avoid all difficulties, by translating "they invaded (or made an irruption into) the tribe of Aser", as the Hebrew will allow. Thus Dan conquered Lais, which lies at so great a distance from his own portion, and the tribes of Juda and Simeon were frequently intermixed. (Calmet)
Aser and Manasses may, however, have been really united on the north-west, or Mediterranean point. (Menochius)