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gptkb:Midcontinent_United_States
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Missouri River (western boundary)
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gptkb:Midcontinent_United_States
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gptkb:Gulf_of_Mexico
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gptkb:Midcontinent_United_States
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gptkb:Pacific_Ocean
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gptkb:Midcontinent_United_States
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major sea
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gptkb:Midcontinent_United_States
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gptkb:Atlantic_Ocean
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gptkb:Midcontinent_United_States
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major ocean
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gptkb:Midcontinent_United_States
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gptkb:Canada
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gptkb:Midcontinent_United_States
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gptkb:Mexico
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gptkb:Midcontinent_United_States
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gptkb:Appalachian_Mountains
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gptkb:Midcontinent_United_States
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major mountain range
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gptkb:Midcontinent_United_States
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gptkb:Rocky_Mountains
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gptkb:Midcontinent_United_States
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Mississippi River (eastern boundary)
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