Ohio, the Buckeye State, is in the Midwest and borders Lake Erie, the southernmost great lake.

 Identify the prepositional phrase in the following sentence.
Ohio, the Buckeye State, is in the Midwest and borders Lake Erie, the southernmost great lake.

the Buckeye State
Reason:

Incorrect. This word group is made up of a proper noun (Buckeye State) and an article. It is not a prepositional phrase.

the southernmost great lake
Reason:

Incorrect. This word group has a noun (lake) and the noun’s modifiers. It is not a prepositional phrase.

borders Lake Erie
Reason:

Incorrect. This word group has a verb (borders) and the object of the verb (Lake Erie). It lacks a subject. It is not a prepositional phrase.

in the Midwest
Reason:

Correct. This is a prepositional phrase that begins with the preposition in. The phrase functions as an adjective modifying the noun Ohio.
Correct Answer

in the Midwest