Glacial action determined the direction and character of the rivers, made numerous swamps, and, by scouring out rock basins, damming rivers and leaving morainal hollows, determined the character and formation of the lakes, of which Minnesota has upwards of io,000, a number probably exceeding that of any other state in the Union.
Deep, but it is shallow at the lower end where the water is held back by a morainal dam, and where only 32 m.
Inland from the Narrows; but on the west and south the hills fall gently to the Coastal Plain, which, occupying the greater part of the island, is broken only by low morainal ridges and terminates in salt marshes along much of the west coast.
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