Question: What popular beach side suburb is situated near both Holdfast Bay and Brighton?

Context paragraphs:
Kingston Park, South Australia: Kingston Park is a small beachside suburb, 17 km south of Adelaide.  Kingston Park is within the City of Holdfast Bay and neighbouring suburbs are Marino, Seacliff and Brighton.

Brighton, South Australia: Brighton is a coastal suburb of Adelaide, South Australia, situated between Seacliff and Glenelg and aside Holdfast Bay.  Some notable features of the area are the Brighton-Seacliff Yacht Club, the Brighton Surf Lifesaving Club, the Brighton Jetty, and its excellent beach.  The Windsor Theatre constructed in 1925 is a long-standing institution, showing cinema to the locals usually two films per night.

Flamenco Beach: Flamenco Beach is a public beach on the Caribbean island of Culebra (] ).  It is known for its shallow turquoise waters, white sand, swimming areas, and diving sites.  It stretches for a mile around a sheltered, horseshoe-shaped bay.  Playa Flamenco is a popular beach destination for both Culebra and Puerto Rico.  In March 2014, Flamenco beach was ranked 3rd best beach in the world with a TripAdvisor Travelers' Choice Award.  In August 2016, it was announced that Flamenco Beach had regained its Blue Flag Beach international distinction.

Holdfast Bay: The Holdfast Bay is a small bay in Gulf St Vincent, next to Adelaide, South Australia.  Along its shores lie the City of Holdfast Bay and the popular beach-side suburb of Glenelg.

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.

Seacliff Park, South Australia: Seacliff Park is a suburb of Adelaide partly in the City of Marion and the City of Holdfast Bay.  The suburb is adjacent to Brighton and Marino.

Avalon, New South Wales: Avalon Beach is a northern beach side suburb of Sydney, in the state of New South Wales, Australia.  It is 37 kilometres north of the Sydney central business district, in the local government area of Northern Beaches Council, in the Northern Beaches region.  The area is also known as Avalon, with the name Avalon Beach being assigned during a change in boundaries and names in the Pittwater region in 2012.

Seacliff, South Australia: Seacliff is a suburb of Adelaide in the City of Holdfast Bay.  The suburb is adjacent to Brighton, Seacliff Park, Marino and Kingston Park.

Firiplaka: Firiplaka or Firiplaka Beach is a beach situated at the southern side in Milos Island, Greece between the other beaches of Provatas (West) and Tsigrado (East).  It is one of the most popular beach on the island.  The beach is extensive with majestic towering volcanic cliffs, snow-grey fine sand and white pebbles and shallow turquoise waters.  There are umbrellas and sunbeds and a bar hut.  There is also a huge rock with a cave under it in the water near the shore and it was sculptured out from a volcanic a long time ago.  The access to the beach is by your own vehicle or taxi or boat which goes around the island from the port of Adamas, you just need to cross through the dirt track which it is in a good condition.

Earnse Bay: Earnse Bay (also known as 'West Shore') is a sand and shingle beach located along the western side of Walney Island in the Borough of Barrow-in-Furness, Cumbria, England.  Along with Sandy Gap and Biggar Bank, Earnse Bay forms a more or less continuous stretch of eight miles of coastline.  The beach offers panoramic views of the Irish Sea, the Isle of Man and the Lake District mountains which have only recently been interrupted by the construction of three large wind farms (Barrow Offshore, Ormonde and Walney).  Earnse Bay was once planned to be developed into a reputable seaside resort to rival other nearby towns such as Morecambe and Blackpool, however these plans never fully materialised.  Despite this, Earnse Bay remains Barrow's most popular beach and is particularly busy with walkers, sunbathers and kitesurfers during the summer months.

Supporting paragraphs: Brighton, South Australia Holdfast Bay
Answer: Glenelg