In Wisconsin, the inner lowland has an interesting feature.
2.
North of this is the inner lowland of the Coastal Plain, or the " Black Prairie, " which includes some and seventeen counties.
3.
It has a relatively rapid descent toward the inner lowland, and a very gradual descent to the coast prairies, which become very low, flat and marshy before dipping under the Gulf waters, where they are generally fringed by off-shore reefs.
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