Question: Lake Mary Jane is located north of a city in what Florida county?
Sentence (from "Lake Hancock"): At 4573 acre , the lake is one of the largest lakes in Polk County, Florida; the center of the cities of Bartow, Lakeland, and Winter Haven roughly form an equilateral triangle with sides of 12 mi and Lake Hancock forms over 25% of that triangle.
Relevant evidence: No