Question: What neighboring suburb of O'Halloran Hill has a population of more than 12,000 people?

Context paragraphs:
Wirth Lake (Minnesota): Wirth Lake is in Theodore Wirth Park, a large park managed by the Minneapolis Park and Recreation Board, but actually in Golden Valley, a neighboring suburb.

Theodore Wirth Park: Theodore Wirth Park is the largest park managed by the Minneapolis Park and Recreation Board.  The park land is shared by Minneapolis and the neighboring suburb of Golden Valley.  The park includes two golf courses (an 18-hole course and a 9-hole par 3 course), Wirth Lake, Birch Pond, and other amenities.  It forms a significant portion of the Grand Rounds Scenic Byway, linking the Chain of Lakes area with the Victory Memorial Parkway.

O'Halloran Hill Recreation Park: O’Halloran Hill Recreation Park is a protected area located about 16 km south of the Adelaide city centre in the suburbs of Seaview Downs and O’Halloran Hill.  The recreation park was proclaimed under the "National Parks and Wildlife Act 1972" in 1989 for "recreation and nature conservation purposes" in respect to parcels of land acquired by the Government of South Australia starting in the 1970s for three purposes - creation of "an open space buffer", provision of "both visual amenity and recreational opportunities for the rapidly growing southern suburbs" and the creation of "a second ring of parklands around Adelaide that would cater for outdoor pursuits, as well as protecting the Hills Face Zone from development".  The recreation park is classified as an IUCN Category III protected area.

Calderwood, New South Wales: Calderwood is a suburb of Wollongong in the City of Shellharbour in New South Wales, Australia, lying to the west of Albion Park.  At the 2016 census , it had a population of 173.  It is currently largely rural, but is proposed for suburban development.  It is estimated that the suburb will one day be home to a population of 12,000 people.

O'Halloran Hill, South Australia: O'Halloran Hill is a suburb in the south of Adelaide, South Australia, situated on the hills south of the O'Halloran Hill Escarpment, which rises from the Adelaide Plains and located 18 km from the city centre via the Main South Road.  The suburb is split between the Cities of Marion and Onkaparinga, and it neighbours Happy Valley, Hallett Cove, Trott Park and Darlington.

WQMX: WQMX (94.9 FM) – branded FM 94.9 WQMX – is a commercial country radio station licensed to Medina, Ohio.  Owned by Rubber City Radio Group, Inc., the station primarily serves the Akron metro area, but also reaches parts of Greater Cleveland.  The WQMX studios are located in Akron, while the station transmitter resides in the neighboring suburb of Copley Township.

Seaview Downs, South Australia: Seaview Downs is a suburb of Adelaide in the City of Marion.  The southern part of the suburb contains the O'Halloran Hill Recreation Park.

WZDA: WZDA (103.9 FM) is a commercial alternative rock radio station licensed to Beavercreek, Ohio, serving the Dayton metro area, owned by iHeartMedia, Inc..  The WZDA studios are located in Dayton, while the station transmitter resides in the neighboring suburb of Moraine.  Besides a standard analog transmission, WZDA broadcasts over two HD Radio channels, and is available online via iHeartRadio.

Hallett Cove, South Australia: Hallett Cove is a coastal suburb in the south of Adelaide, South Australia, with a population of more than 12,000 people.  Adjoining suburbs are Marino to the north, Trott Park and Sheidow Park to the east and Lonsdale to the south.  It is within the City of Marion local government area.  The Hallett Cove Shopping Centre is the suburb's largest shopping centre, and has recently undergone a major redevelopment.  New features include underground parking, a food court, a Big W department store and a Woolworths supermarket in addition to the Drake Foodmarkets owned Foodland already in place.

Cedar Lake Trail: The Cedar Lake Regional Trail is America's first bicycle freeway.  It is a rail trail that runs about 4.3 mi from downtown Minneapolis, Minnesota ( ) west to Minnesota State Highway 100 in the neighboring suburb of St. Louis Park( ).  The trail was inaugurated on February 17, 1995.  At the trail's west end, pavement continues for another 4.2 mi as the Hutchinson Spur Trail through St. Louis Park to Hopkins.  In 2009, the "Hutch Spur" was renamed "North Cedar Lake Trail."  The two trails are paved for their entire lengths.

Supporting paragraphs: O'Halloran Hill, South Australia Hallett Cove, South Australia
Answer: Hallett Cove