Viken County Municipality

Vestmarka is a forested and hilly area in Asker, Bærum and Lier which constitutes part of Oslomarka, Norway. The land is owned by Løvenskiold Vækerø and is a popular recreational area. It was the site of Braathens SAFE Flight 239, a plane crash on 23 December 1972.

Braathen SAFE Flight 239, also known as the Asker Accident (Norwegian: Asker-ulykken), was a controlled flight into terrain of a Fokker F28 Fellowship into Vestmarka in Asker, Norway, on 23 December 1972 at 16:33. The Braathens SAFE aircraft was en route on a scheduled flight from Ålesund Airport, Vigra and crashed during approach to Oslo Airport, Fornebu. Forty of the forty-five people on board the aircraft died, making it the deadliest civil aviation accident in Norway until Vnukovo Airlines Flight 2801 in 1996. According to Norwegian newspaper Dagbladet on 23 December 1992, a Danish citizen died of late complications in 1976. The pilots took a short-cut during approach on runway 06 at Fornebu. Combined with false signals from the instrument landing system (ILS), this caused the pilots to misunderstand their location. This in turn led them to take an incorrect landing path, causing the plane to hit ground in a hilly area. The rescue operation was initiated almost immediately, but it took six and a half hours to find the aircraft. Three years later, the investigation commission concluded that various measures should be put in place to improve navigation, to avoid similar situations in which pilots misunderstood their location.

Semsvannet is a lake in Asker municipality in Akershus county, southwest of Oslo, in Norway. The lake is situated close to, for the Norwegians, famous places such as the ridge Skaugumsåsen, the old cultural house Tangen and Skaugum the official residence of the heir to the throne of Norway, i.e. the crown prince or princess of Norway. The status of Semsvannet as a nature reserve was upgraded when the area was protected as a conservation area October 2, 1992. The lake and its vicinity was elected a millennium site in the year 2000.

TOMRA is a Norwegian multinational corporation manufacturing collection and sorting products, such as reverse vending machines for the food, recycling and mining industries. With over 82,000 (RVMs) installed, 10,000 food sorters and 6,000 recycling systems worldwide, TOMRA is the market leader in its industries.TOMRA is listed on the Oslo Stock Exchange (OSEBX) under the ticker symbol TOM. The parent company, Tomra Systems ASA, is headquartered in Asker, Norway, with central departments located in Mülheim-Kärlich, Germany and Shelton, Connecticut.

Sem is a village in Asker, Akershus, Norway.

Drengsrud is a village in Asker municipality, Akershus county, Norway.

The Asker International School (AIS) is an international school in Asker, Norway.

Dikemark Hospital is a psychiatric hospital with 170 patients in Asker, Norway. The hospital was owned and managed by the municipality of Oslo but has been a part of Ullevål hospital since 2001. It was opened in 1905, when the city council of Christiania bought the farm Dikemark, in Asker. Patients were moved from the "Christiania municipal insanity asylum" (Sindssygeasyl) to the newly established Dikemark psychiatric hospital. The hospital consists of the following departments: National Coordination Unit for Sentences to Compulsory Mental Health Care, Psychosis Unit 1, Psychosis Unit 2, Regional Competence Service for Psychiatry and Developmental Disorders, Regional Section of Psychiatry and Developmental Disorders (PUA), Regional Security Section (RSA), Section for Psychosis Treatment and Security Psychiatric C. In 1981, several film canisters containing the original cut of the 1928 silent film The Passion of Joan of Arc were discovered in a janitor closet in the hospital.

Føyka Stadion (also called Asker Stadion) is a sports stadium in Asker, Norway with running track. It is currently used mostly for association football matches, and is the home ground of Asker Fotball. The stadium has a capacity of 2,000.

Ovenstadlia is a village in Lier municipality, Norway. Located just north of the village Kjenner, it is a part of the urban area Kjenner, which has a population of 1,574.

Lieråsen Tunnel is a single-tubed railway tunnel of the Drammen Line situated in Asker and Lier in Norway. At a length of 10.723 kilometers (6.663 mi), the double track tunnel is located immediately between Asker Station and Lier Station. It is used for a mix of short- and long-haul passenger trains and freight trains. Construction of the tunnel commenced in 1962, along with a new section of track between the tunnel and Brakerøya Station. Inadequate geological surveys ahead of construction resulted in the tunnel being built in the middle of an altered and crushed zone, delaying construction and eventually shifting the route 300 meters (980 ft) to the southwest. The tunnel opened on 3 June 1973. In addition to providing double track, it shortened the Drammen Line by 12.4 kilometers (7.7 mi). Part of the old section of the Drammen Line became the Spikkestad Line, while the rest of line was closed. Lieråsen was the longest railway tunnel in the country until the Romerike Tunnel opened in 1999.

Borgen is a suburb located in the municipality of Asker, Norway. Located some 40 kilometres west of Oslo, Borgen has many different styles of residential areas, ranging from the apartment complexes and semi-detached houses in the southern area of Borgen, to the villas of Borgen Skog. There are two elementary schools, Rønningen Barneskole and Hagaløkka Barneskole, and middle school, Borgen Ungdomsskole. Mount Vardåsen offers downhill skiing in winter, and during the rest of the year nice terrain for Orienteering.