Matthew Poole and continuators on Joshua 16:4

4 So the children of Joseph, Manasseh , and Ephraim, took their inheritance .

i. e. Half Manasseh, by a Synecdoche.

i. e. Their several Portions which here follow. Some think that they had but one Lot between them, and therefore they are now said to take their inheritance, to wit, by dividing it between them according to the direction of Ioshua and Eleazar, &c. For that Phrase being used of them, and not, to my remembrance, of any other Tribes, may seem to have some peculiar signification, which doth not agree to the other Tribes. But there being mention of a peculiar Lot taken out for Manasseh, Josh. 17. 1. shews that their several inheritances fell to them, as the rest did to the other Tribes, even by several Lots: and it is said of them, that they took their inheritance, which also Iudah had done before them, because the Tribes of Iudah and Ioseph did take their Inheritances before the rest; and it was fit they should do so, for the security of the main Camp, and the body of the people which were at Gilgal. See Ios. 18. 5.

i. e. The North-east side. It is no wonder, if some of these Descriptions are dark and doubtful to us at this distance of time and place; there having been so many alterations made in places, and so many circumstances, being now altogether undiscoverable. But this is evident to every man of common sense, that this and all the descriptions here mentioned, were then certain and evident to the Israelites, because these were the foundation of their present practice, and of all the Possessions which then they took, and peaceably possessed in succeeding Ages.