Bay Circuit Trail is a hiking trail in Worcester County and Middlesex County, Massachusetts. It is 3.2 miles long and begins at 211 feet altitude. Traveling the entire trail is 0.3 miles with a total elevation gain of 36 feet. Lamb Hill (elevation 223 feet) is near the trailhead. There are also parkings. Wildcat Hill (elevation 433 feet) can be seen along the trail.
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