beginning at a point on Lake Michigan, where the line dividing the States of Indiana and Illinois intersects the saline thence with the margin of said Lake, to the intersection of the southern boundary of a cession made by the Pottawatomie, at the treaty of the Wabash, of eighteen hundred and twenty-six; thence east, to the northwest corner of the cession made by the treaty of St. Joseph's, in eighteen hundred and twenty-eight; thence south ten miles; thence with the Indian boundary line to the Michigan road; thence south with said road to the northern boundary line, air designated in the treaty of eighteen hundred and twenty-six, with the Pottawatomie; thence west with the Indian boundary line to the river Tippecanoe; thence with the Indian boundary line, as established by the treaty of eighteen hundred and eighteen, at St. Mary's to the line dividing the States of Indiana and Illinois; and thence north, with the line dividing the said States, to the place of beginning.〔