Question: What road forms the eastern boundary of the inner northern suburb of the capital city of South Australia?
Context: Beach Road is a major east-west road in the northern suburbs of Perth, Western Australia, connecting Perth's inner northern beachside suburbs and inland state housing areas with shopping and public transport facilities at Warwick and the Malaga industrial area.  It was mostly built between 1967 and 1974, and is a dual carriageway for most of its length, except for a small western part between Marmion Avenue and the coast, which is a minor residential distributor road and is discontinuous at Marmion Avenue.  Beach Road also serves as a local government boundary.  From Alexander Drive to Wanneroo road beach road is the boundary with the City of Wanneroo on the northern side and the City of Stirling on the southern side.  From Wanneroo Road to the coast Beach Road is the boundary with the City of Joondalup (part of City of Wanneroo until 1998) on the northern side and the City of Stirling on the southern side. Westcott Barton, also spelt Wescot Barton or Wescote Barton, is a village and civil parish on the River Dorn in West Oxfordshire about 7 mi east of Chipping Norton and about 9+1/2 mi south of Banbury.  The parish is bounded to the north by Cockley Brook, a tributary of the River Dorn.  A minor road to Kiddington forms part of the eastern boundary, another minor road forms part of the western boundary and the remainder of the parish boundaries are field boundaries. Medindie (formerly known as Medindee) is an inner northern suburb of Adelaide the capital of South Australia.  It is located adjacent to the Adelaide Park Lands, just north of North Adelaide, and is bounded by Robe Terrace to the South, Northcote Terrace to the East, Nottage Terrace to the North and Main North Road to the Northwest. Buckland Park is a suburb on the rural outskirts of Adelaide, the capital city of South Australia.  Port Wakefield Road, the main highway taking traffic to the north of Adelaide, passes the eastern boundary.  The northern boundary is the Gawler River, and the western side is Gulf St Vincent.  Buckland Park is named after an early pioneer homestead in the area.  Buckland Park is the site of the Adelaide region weather radar.  Market gardening is the main activity as the soil is predominantly on the flood plain of the lower Gawler River.  Walker Corporation proposes to develop a large housing development in the area with up to 33,000 residents by 2036, however some critics are concerned about the isolation from the rest of Adelaide and the threat of flooding. The Cathays ( ) electoral ward of Cardiff consists of some or all of the following areas: Blackweir, Cardiff city centre, Cathays, Cathays Park and Maindy in the parliamentary constituency of Cardiff Central.  It is bounded by Gabalfa and Birchgrove to the north; Plasnewydd and Adamsdown to the east; Butetown to the south; and Riverside to the west.  The River Taff forms its western boundary to where it meets the South Wales Main Line, the South Wales Main Line forms the southern boundary to where it meets the Valley Lines northbound branch, this railway line then forms the eastern boundary as far as the A48 road.  The Northern boundary follows the A48 as far as Allensbank Road where it follows this road south then turns north again along Whitchurch Road.  It turns west along Crown Way, then south along the A470 until North Road where it bears west, passing just south of the student halls, until it meets the River Taff.  The tallest building in Wales is here and is also part of the Cardiff's CBD. Pascoe Vale Road is a major thoroughfare through the inner northern suburbs of Melbourne continuing to the outer northern suburbs.  It runs in the South from its junction with Mount Alexander Road at Moonee Ponds Junction and continues North through the suburbs of Moonee Ponds, Essendon, Strathmore, forms the boundary between Pascoe Vale and Oak Park, continues through Oak Park, then on to Glenroy, forms the boundary between Jacana and Broadmeadows, continues through Broadmeadows, then forms the boundary between Meadow Heights and Coolaroo, before terminating at its intersection with Somerton Road, at the confluence of the suburbs of Meadow Heights, Coolaroo and Roxburgh Park.  The road operates as an undivided road for much of its length, however, north of Broadmeadows, it becomes dual carriageway with an 80 km/hr speed limit. Fitzroy is an inner northern suburb of Adelaide 4 km from the Adelaide city centre, in the state of South Australia, Australia within the City of Prospect.  It is adjacent to North Adelaide, Prospect, Ovingham and Thorngate.  The post code for Fitzroy is 5082.  It is bounded to the west by Cotton Street, to the south by Fitzroy Terrace, in the east by Prospect Road and the north by Avenue Road.  Fitzroy is essentially a residential suburb, overlooking the North Adelaide Parklands. Gilberton is an inner northern suburb of Adelaide, South Australia on the northern bank of the River Torrens a short distance from Adelaide’s city centre.  It is bounded by the river, Park terrace, Stephen Terrace and Northcote Terrace.  The suburb is largely residential with some large and ornate Victorian homes and approximately 2 km of the Torrens Linear Park as its southern boundary.  The large homes in the suburb's northern section give it a historic character that is protected by Government planning regulations. Cameia National Park is a national park in the Moxico province of Angola, located at about 1100 m above sea level.  It shares its name with the nearby municipality of Cameia.  The Cameia–Luacano road forms the northern boundary of the park with the Chifumage River forming the southern portion of the eastern boundary and the Lumege and Luena rivers the south-western boundary.  Much of the park consists of seasonally inundated plains that form part of the Zambezi river basin, with the northern half of the park draining into the Chifumage river.  There are also extensive miombo woodlands, similar to those in the Zambezi basin of western Zambia.  The park is a sample of nature not occurring elsewhere in Angola.  Two lakes, Lago Cameia and Lago Dilolo (the largest lake in Angola) lie outside the park boundaries and both have extensive reedbeds and grassy swamps that are rich in aquatic birds. Prospect is an inner northern suburb of Adelaide, the capital city of South Australia.
Answer: Prospect Road