Information: - Stromsborg is a small islet in central Stockholm, Sweden, located north of Stadsholmen, and west of Helgeandsholmen, between the bridges Centralbron, a motorway passing through central Stockholm, and Vasabron. Stromsborg is part of Gamla stan, the old town of Stockholm and is connected to the rest of the world by the bridge Stromsborgsbron leading over to Vasabron. - Helgeandsholmen is a small island in central Stockholm, Sweden. It is located north of Stadsholmen, and east of Stromsborg, with which, together with Riddarholmen, it forms Gamla stan, the old town of Stockholm. Helgeandsholmen contains the Riksdag Building and the Museum of Medieval Stockholm, and is connected to neighbouring islands through three bridges: Riksbron, Stallbron, and Norrbro. - Stadsholmen is the historical name of an island in the centre of Stockholm, Sweden. Together with the small islands of Riddarholmen and Helgeandsholmen it forms the Old town of Stockholm. - Riksbron ( Swedish : '' The National Bridge '' or '' The State Bridge '' ) is an arch bridge in central Stockholm , Sweden leading from Drottninggatan on Norrmalm 44 metres over to Riksgatan on Helgeandsholmen . The name is derived from the bridge 's proximity to several buildings of national importance , including Riksdagen , the Parliament Building ; Rosenbad , the Prime Minister 's Office and the Government Chancellery ; and the Sager House , official residence of the Prime Minister . Nearby bridges include Stallbron , Norrbro , and Vasabron . - Stallbron (Swedish: "The Stable Bridge") is an arch bridge located in Gamla stan, the old town in central Stockholm, Sweden. Stretching some 20 meters over Stallkanalen it connects Riksgatan passing through the Parliament Building on Helgeandsholmen to the square Mynttorget on Stadsholmen from where Vasterlanggatan extends it further south. - Riddarholmen ("The Knights' Islet") is a small islet in central Stockholm, Sweden. The island forms part of Gamla Stan, the old town, and houses a number of private palaces dating back to the 17th century. The main landmark is the church Riddarholmskyrkan, used as Sweden's royal burial church from the 17th century to 1950, and where a number of earlier Swedish monarchs also lie buried. - The Baltic Sea ( ; ) is a sea of the Atlantic Ocean, enclosed by Scandinavia, Finland, the Baltic countries, and the North European Plain. It includes the Gulf of Bothnia, the Bay of Bothnia, the Gulf of Finland, the Gulf of Riga, and the Bay of Gdask. The sea stretches from 53N to 66N latitude and from 10E to 30E longitude. A mediterranean sea of the Atlantic, with limited water exchange between the two bodies, the Baltic Sea drains through the Danish islands into the Kattegat by way of the straits of resund, the Great Belt, and the Little Belt. - Norrstrom in central Stockholm connects Lake Malaren with the Baltic Sea. It runs from Riddarfjarden, north of Gamla stan, to Saltsjon. Two islands lie within it, Stromsborg and Helgeandsholmen. It is one of two natural waterways between Malaren and the Baltic sea, the other being Soderstrom south of Gamla stan. Norrstrom is crossed by Centralbron and the adjacent pedestrian bridge, Vasabron, Riksbron north of Helgeandsholmen which continues into Riksgatan and Stallbron south of the island, Norrbro crossing Helgeandsholmen, and Strombron. - Drottninggatan ("Queen Street") in Stockholm, Sweden is a major pedestrian street. It stretches north from the bridge Riksbron at Norrstrom, in the district of Norrmalm, to Observatorielunden in the district of Vasastaden. - Riksgatan (Swedish: "National Street") is a street in Gamla stan, the old town in central Stockholm, Sweden. Located on Helgeandsholmen, and passing between the eastern and the western buildings of the Swedish Parliament Buildings, makes it the official address of the Parliament. - Stockholm (or ) is the capital of Sweden and the most populous city in the Nordic countries; 932,917 people live in the municipality, approximately 1.5 million in the urban area, and 2.3 million in the metropolitan area. The city is spread across 14 islands on the coast in the southeast of Sweden at the mouth of Lake Malaren, by the Stockholm archipelago and the Baltic Sea. The area has been settled since the Stone Age, in the 6th millennium BC, and was founded as a city in 1252 by a Swedish statesman Birger Jarl. It is also the capital of Stockholm County. - Malaren, historically referred to as Lake Malar in English, is the third-largest freshwater lake in Sweden (after Vanern and Vattern). Its area is 1,140km and its greatest depth is 64 m. Malaren spans 120 kilometers from east to west. The lake drains, from south-west to north-east, into the Baltic Sea through the Sodertalje Canal, Hammarbyslussen, Karl Johansslussen and Norrstrom. The easternmost bay of Malaren, in central Stockholm, is called Riddarfjarden. The lake is located in Svealand and bounded by the provinces of Uppland, Sodermanland, Narke, and Vastmanland. The two largest islands in Malaren are Selaon (91km) and Svartsjolandet (79km). - Norrbro (Swedish: "North Bridge") is an arch bridge over Norrstrom in central Stockholm. It extends north from the northern front of the Royal Palace passing over Helgeandsholmen in front of the Riksdag building, and from there over to Gustav Adolfs torg. Norrbro was designed by the city architect Erik Palmstedt (17411803) in a neoclassical style. - Gamla stan ("The Old Town"), until 1980 officially Staden mellan broarna ("The Town between the Bridges"), is the old town of Stockholm, Sweden. Gamla stan consists primarily of the island Stadsholmen. Officially, but not colloquially, Gamla stan includes the surrounding islets Riddarholmen, Helgeandsholmen, and Stromsborg. What is the relationship between 'riksbron' and 'norrstrom'?
A:
crosses