Central Parkway just northwest of Citi Field. For the next mile (1.6 km), NY 25A is a limited-access highway connecting the Grand Central Parkway with I-678. This was a former segment of the Belt Parkway system, originally intended to be part of the formerly proposed Astoria Expressway. Northern Boulevard continues through Flushing—where it was once known as Broadway—towards Bayside. The route travels generally easterly across Bayside, intersecting with the Clearview Expressway (I-295) along the way. Not far to the east, it crosses over the Cross Island Parkway at Alley Pond Park. Past the Cross Island Parkway, NY 25A goes through Douglaston and Little Neck before crossing the New York City line into Nassau County. The five-mile (8 km) stretch of Northern Boulevard stretching eastward from Flushing has been described as roughly coterminous with the Long Island Koreatown (롱 아일랜드 코리아타운). Nassau County NY 25A, still bearing the Northern Boulevard name, crosses into Nassau County at the Great Neck hamlet known as University Gardens. It winds its way around a steep curve in the Great Neck area before descending into Manhasset and the hamlet's Miracle Mile shopping area. The route continues eastward, intersecting with NY 101 and Nassau County Route 101 (Port Washington Boulevard and Searingtown Road, respectively) just south of Port Washington, in the villages of Flower Hill (on its north side) and Roslyn Estates (on its south side), ahead of a split in Northern Boulevard. Old Northern Boulevard, which once carried the NY 25A designation, is the old route, which passes through the village of Roslyn, whilst Northern Boulevard itself bypasses the village via. the Roslyn Viaduct, which carries NY 25A over Hempstead Harbor. The old and new routes converge east of the viaduct at an interchange with Bryant Avenue, and Northern Boulevard heads northeastward through East Hills and Greenvale, where it intersects with Glen Cove Road. In Brookville, NY 25A passes the New York Institute of Technology and the C.W. Post Campus of Long Island University before intersecting with NY 107. Past this point, the route slowly curves back to the east ahead of a junction with NY 106 south of East Norwich. NY 25A's run as a four-lane road ends here, and the route becomes a simple two-lane country road. It briefly reverts to four lanes at Cold Spring Road, and the highway enters Suffolk County less than a mile (1.6 km) later. Some discrepancy exists over