Question: Both Greenhill and Waterfall Gully are both suburbs of what city?

full_context: Document 1: Cleland Conservation Park: Cleland Conservation Park is a protected area located in the Adelaide Hills, South Australia about 22 km south-east of the Adelaide city centre. Cleland Conservation Park conserves a significant area of natural bushland on the Adelaide Hills face and includes the internationally popular "Cleland Wildlife Park" and the popular tourist destinations of Mount Lofty summit and Waterfall Gully. It is maintained by the South Australian Department of Environment, Water and Natural Resources (DEWNR).
Document 2: Eagle On The Hill, South Australia: Eagle On The Hill is an unbounded locality of Adelaide in the Adelaide Foothills. It borders Mount Osmond and Waterfall Gully.
Document 3: Onkaparinga Hills, South Australia: Onkaparinga Hills is a southern suburb of Adelaide, in the City of Onkaparinga. It covers an area of approximately 22 km2 . It has a population of 2534 people (2011 Census). It is a leafy suburb that includes parts of the Onkaparinga River National Park.
Document 4: Glen Osmond, South Australia: Glen Osmond is a suburb of Adelaide, South Australia in the City of Burnside which is in the foothills of the Adelaide Hills. It is well known for the road intersection on the western side of the suburb, where the South Eastern Freeway (National Route M1) from the Adelaide Hills and the main route from Melbourne splits into National Route A17 Portrush Road (north, the main route towards Port Adelaide), Glen Osmond Road, Adelaide (northwest towards Adelaide city centre) and state route A3 Cross Road west towards the coast and southern suburbs.
Document 5: Greenhill, South Australia: Greenhill is a suburb of Adelaide located about 9.3 km east of the city centre in the foothills of the Adelaide Hills. Its boundaries were created in October 2001 in respect of the “long established name” with some land being moved into the adjoining suburb of Waterfall Gully in July 2002. The suburb includes Greenhill Recreation Park and the western slopes of Mount Lofty. Greenhill Creek flows through Waterfall Gully and feeds into First Creek.
Document 6: Burnside, South Australia: Burnside is a small suburb that is part of the City of Burnside in the eastern suburbs of Adelaide. It is primarily a residential suburb, and was one of the first suburbs of Adelaide. It was named Burnside, an amalgamation of the Scottish word for creek, "burn" and "side" because of the original property's location on the side of Second Creek. Burnside is 5 km east of the Adelaide city centre.
Document 7: Glenelg, South Australia: Glenelg is a popular beach-side suburb of the South Australian capital of Adelaide. Located on the shore of Holdfast Bay in Gulf St Vincent, it has become a popular tourist destination due to its beach and many attractions, home to several hotels and dozens of restaurants.
Document 8: Waterfall Gully, South Australia: Waterfall Gully is an eastern suburb of the South Australian capital city of Adelaide. It is located in the foothills of the Mount Lofty Ranges around 5 km east-south-east of the Adelaide city centre. For the most part, the suburb encompasses one long gully with First Creek at its centre and Waterfall Gully Road running adjacent to the creek. At the southern end of the gully is First Falls, the waterfall for which the suburb was named. Part of the City of Burnside, Waterfall Gully is bounded to the north by the suburb of Burnside, from the north-east to south-east by Cleland Conservation Park (part of the suburb of Cleland), to the south by Crafers West, and to the west by Leawood Gardens and Mount Osmond.
Document 9: Wayville, South Australia: Wayville is an inner-southern suburb of Adelaide in the City of Unley. It is most notable for its hosting of the Royal Adelaide Show at the Adelaide Showgrounds. The suburb is bordered to the north with the southern Parklands of Adelaide, and mostly to the south with the tramline. The particular bordering locations of the South Park Lands are as follows: Kurrangga, Walyo Yerta, Minno Wirra, and Wikaparndo Wirra. The southern border consists of a number of landmarks. Starting at the Leader Street train crossing, the boundary follows Leader Street until Goodwood Road. The boundary then follows Parsons Street and crosses the tramline. Finally the southern boundary follows Simpson Parade. The east boundary is King William Road and the western boundary is the train tracks. Keswick Creek flows through the southern side of the suburb.
Document 10: Mount Osmond, South Australia: Mount Osmond is a small suburb of 2,497 people in the South Australian capital city of Adelaide. It is part of the City of Burnside local government area and located in the foothills of the Adelaide Hills, five kilometres south east of the city centre. The suburb is high on the hill of the same name, which is the last hill on the right when approaching Adelaide down the South Eastern Freeway before the road levels out onto the Adelaide Plains. It is bounded to the north by the suburb of Beaumont, to the north-east by Burnside, to the east by Waterfall Gully, to the south by Leawood Gardens/Eagle On The Hill, to the south-west by Urrbrae, to the west by Glen Osmond and to the north-west by St Georges.
Document 11: Chambers Gully: Chambers Gully is an offshoot of Waterfall Gully in the Eastern Suburbs of Adelaide, South Australia. It used to be a local landfill but in the past decade has been reclaimed as a park by volunteer work. It contains a number of old ruins, walking trails, springs and is an excellent place to spot local wildlife such as koalas.
Document 12: Cleland, South Australia: Cleland is a suburb in South Australia located in the Adelaide metropolitan area about 10 km south-east of the Adelaide city centre. Its boundaries were created in October 2001, with additional land being added in 2010 from the adjoining suburb of Crafers. Its name is derived from the Cleland Conservation Park. The principal land use within the locality is conservation with the majority of its land area being occupied by the Cleland Conservation Park. Places within its extent include the summit of Mount Lofty. Cleland is located within the federal Division of Mayo, the state electoral district of Bragg and the local government area of the Adelaide Hills Council.
Document 13: Geology of South Australia: South Australia is an Australian state, situated in the southern central part of the country, and featuring some low-lying mountain ranges, the most significant being the Mount Lofty Ranges, which extend into the state's capital city, Adelaide, which comprises most of the state's population. Adelaide is situated on the eastern shores of Gulf St Vincent, on the Adelaide Plains, north of the Fleurieu Peninsula, between Gulf St Vincent and the low-lying Mount Lofty Ranges. The state of South Australia, which stretches along the coast of the continent and has boundaries with every other state in Australia, with the exception of the Australian Capital Territory and Tasmania. The Western Australia border has a history with South Australia, involving the South Australian Government Astronomer, Dodwell and the Western Australian Government Astronomer, Curlewis in the 1920s to mark the border on the ground.
Document 14: Adelaide Hills Council: Adelaide Hills Council is a local government area in the Adelaide Hills of South Australia. It is in the hills east of Adelaide, the capital of South Australia, and extends from the South Para Reservoir in the north to the Mount Bold Reservoir in the south.
Document 15: Adelaide Hills: The Adelaide Hills are part of the Mount Lofty Ranges, east of the city of Adelaide in the state of South Australia. It is unofficially centred on the largest town in the area, Mount Barker, which has a population of around 29,000 and is also one of Australia's fastest growing towns.
ground_truth: Adelaide