Oslofjord

The Oslo Graben or Oslo Rift is a graben formed during a geologic rifting event in Permian time, the last phase of the Variscan orogeny. The main graben forming period began in the late Carboniferous, which culminated with rift formation and volcanism, with associated rhomb porphyry lava flows. This activity was followed by uplifting, and ended with intrusions about 65 million years after the onset of the formation. It is located in the area around the Norwegian capital Oslo. The lava production was high when the rhomb porphyry lavas were deposited. The lavas reflect a period of abundant earthquake-related movements, when tectonic forces tore the crust apart. In the Vestfold district, one lava flow was deposited on average every 250,000 years, resulting in a 3000-metre thick sequence of mainly volcanic material. In the Oslo area, lavas were deposited on average every 800,000 years. Only a few plant remains have been found between these lavas. The bedrock in this area, roughly from Skien to Oslo and Mjøsa, results in soil rich in nutrients important for plant growth. Since the Permian, erosion has removed the volcanic peaks and indeed most of the lava layer and laid bare the magma chambers and volcanic pipes deep below, allowing scientist a rare view of what goes on beneath a rift valley. Several of the old magma plumes are now quarried, the rich black larvikite (named from Larvik, a town south of Oslo) being one. The Särna alkaline complex in western Sweden, also of Late Carboniferous age, is thought to be related to the Oslo Graben as it is aligned to it.

Spro is a village in Nesodden municipality, Akershus, Norway. It is a former site of ice block extradition industry, and there are a number of man-made ponds created for this purpose. The village is located in southern Nesodden, between Fjellstrand in the north and Fagerstrand in the south. On the opposite of the Oslofjord is Nærsnes in Røyken.

Svestad is a village and a former oil and gas harbour in Akershus, Norway. Svestad is situated at the Oslofjorden side of the peninsula and municipality of Nesodden just south of Oslo.

Slemmestad is a village in Røyken in Asker municipality in Akershus, Norway. Slemmestad is located on the west bank of the Oslofjord, west of Oslo.

Konglungen is a village in Asker municipality, Norway. Its population in 1999 was 208, but since 2001 it is not considered an urban settlement by Statistics Norway, and its data is therefore not registered.

Håkavik is a village in Akershus, Norway. It is perhaps most famous for lending its name to the eponymous power station in neighboring Buskerud.

Nærsnes is a village in Røyken in Asker municipality in Akershus, Norway. It is located along the Oslofjord between Båtstø and Slemmestad. As of 2003, it is considered a part of the Greater Oslo area.At the end of the 19th century, ice blocks from Nærsnes were exported to Europe, through Drammen. Around 100 sailing ships handled the transportation from Drammen.Nærsnes Church (Nærnes kirke) was consecrated as the chapel in 1900. During 1924–1925, it was extensively rebuild after plans by architect Alfred Christian Dahl (1857- 1940) .The organ in the church was built by Eriksen and Svendsen in 1860. The bell was cast by Olsen Nauen Kløstøperi in 1925.

Sjøstrand is a fishing village in Asker, Akershus, Norway.

Fjellstrand is a village in Nesodden municipality, Akershus, Norway. The population was 832 as at 2005. A hairdresser and a grocery store can be found near the central bus stop of Fjellstrand. A relatively rocky beach at the ironically named Paradise Bay is one of the few tourist attractions in this area. Fjellstrand reached its peak in the 1920s, when it was the biggest rural district on the Nesodden peninsula, and beloved as a cabin area for the wealthy white collar workers of western Oslo. Since then, the importance of this place has been steadily declining. However, the Christian community and its house "Betania", centrally placed in this rural district, has gained some importance in the region. The place by some often referred to as the Bible belt of eastern Norway. Dagfinn Høybråten, the leader of the Christian Democratic Party (KrF) has contributed to the establishment of this impression.

Bjerkås is a village in Asker municipality, Norway.

Vollen is a part of the Asker municipality in Akershus county, Norway. For statistical purposes, it is usually treated as part of the Oslo urban area. It is mainly a residential area, though the area has a café, a restaurant, several art galleries, a primary school and secondary school.

Nesøya is a small island in the municipality of Asker, Norway. It is linked to the mainland via a bridge. The island is known for having a number of celebrities and members of the Norwegian financial elite among its residents. It also one of the wealthiest areas in the entire country, with some properties having been sold for close to and even over $10,000,000. The mean net worth per resident was $575,816 in 2016, and the mean income was $103,601.Much of the eastern part of the island is a nature reserve. The island most likely got its name from the farm Nes on the mainland. This farm is assumed to have been one of the oldest ones in the district.