For a point of beginning, begin at the southwest corner of District 1 known as the centerline of the St. Johns River and the centerline of the Isaiah D. Hart Bridge; thence north and northeast along the centerline of the St. Johns River to a line south of Exchange Island; thence southeasterly along a line southwest of Exchange Island to the centerline of Dames Point Bridge; thence southerly along the centerline of Dames Point Bridge and 9A to the centerline of Southside Connector BV; thence southerly along the centerline of Southside Connector BV to the centerline of Tredinick PY to the centerline of 9A; thence southerly along the centerline of 9A to the centerline of Atlantic BV; thence westerly along the centerline of Atlantic BV to the centerline of Isaiah D. Hart Bridge; thence northwesterly along the centerline of Isaiah D. Hart Bridge to the centerline of the St. Johns River and the point of beginning.