Shonkin Sag: Montana’s Forgotten Geologic Wonder

August 1, 2026

This now dry channel of the ice age path of the Missouri River is what we call the Shonkin Sag. Stretching over 60 miles long from the town of Highwood to just east of Geraldine, the “Sag” was approximately one and a half miles wide and up to 300 feet deep.

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Shonkin Sag: Montana’s Forgotten Geologic Wonder <body> <h1> Array ( [0] => ahonkin sag: montana’s forgotten geologic wonder [1] => zhonkin sag: montana’s forgotten geologic wonder [2] => xhonkin sag: montana’s forgotten geologic wonder [3] => dhonkin sag: montana’s forgotten geologic wonder [4] => ehonkin sag: montana’s forgotten geologic wonder [5] => whonkin sag: montana’s forgotten geologic wonder [6] => sgonkin sag: montana’s forgotten geologic wonder [7] => sbonkin sag: montana’s forgotten geologic wonder [8] => snonkin sag: montana’s forgotten geologic wonder [9] => sjonkin sag: montana’s forgotten geologic wonder [10] => suonkin sag: montana’s forgotten geologic wonder [11] => syonkin sag: montana’s forgotten geologic wonder [12] => shinkin sag: montana’s forgotten geologic wonder [13] => shknkin sag: montana’s forgotten geologic wonder [14] => shlnkin sag: montana’s forgotten geologic wonder [15] => shpnkin sag: montana’s forgotten geologic wonder [16] => sh0nkin sag: 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