Vestmarka

Viken County Municipality (Norwegian: Viken fylkeskommune) is the democratically elected regional governing administration of Viken county in Norway. The main responsibilities of the county municipality includes the overseeing the county's 21 upper secondary schools, county roadways, public transport, dental care, culture, and cultural heritage. The public transportation in the county is managed by Brakar, Østfold Kollektivtrafikk, and Ruter. Ruter is co-owned with the city of Oslo.

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.

Sem is a village in Asker, Akershus, Norway.

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.

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

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

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.

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.

Skaugumsåsen is a mountain in Asker in the county of Akershus, in southeastern Norway.

Skaugum is an estate, manor house and the official residence of Crown Prince Haakon of Norway and his wife Crown Princess Mette-Marit. The estate is located in Asker, 19 km (12 mi) southwest of Oslo, by the foot of the mountain Skaugumsåsen. The estate consists of 48 ha (120 acres) of agricultural lands and 50 ha (120 acres) of woodlands.

The Skaugum Tunnel (Norwegian: Skaugumtunnelen) is a 3,790-meter (2 mi) long railway tunnel in Asker, Norway, on the Asker Line. The tunnel runs between Asker Station and Solstad and was built as part of the first stage of the Asker Line, between Asker and Sandvika. Construction started in February 2002 and the tunnel opened on 27 August 2005. The tunnel was built by Mika for the Norwegian National Rail Administration using the drilling and blasting method with one crosscut. During construction there was one blasting accident. Since the tunnel opened, there have been problems with leaks damaging the infrastructure. The tunnel has double track, is electrified and allows for a maximum speed of 160 kilometers per hour (99 mph). The cost to build the tunnel, excluding the infrastructure, was 450 million Norwegian krone (NOK). The tunnel has accelerated intercity and regional traffic west of Oslo and freed up capacity for the Oslo Commuter Rail on the old Drammen Line.