Question: Robert Johann Maria König was born in a city approximately 30 km south of what?
Context: Linz ( ; ] ; Czech: "Linec" ) is the third-largest city of Austria and capital of the state of Upper Austria (German: "Oberösterreich" ).  It is in the north centre of Austria, approximately 30 km south of the Czech border, on both sides of the River Danube.  The population of the city is , and that of the Greater Linz conurbation is about 271,000. Bnin is a village in the administrative district of Gmina Boniewo, within Włocławek County, Kuyavian-Pomeranian Voivodeship, in north-central Poland.  It lies approximately 30 km south of Włocławek and 73 km south of Toruń. Gmina Cisna is a rural gmina (administrative district) in Lesko County, Subcarpathian Voivodeship, in south-eastern Poland, on the Slovak border.  Its seat is the village of Cisna, which lies approximately 30 km south of Lesko and 95 km south of the regional capital Rzeszów. City Safety is an auto brake technology that assists in reducing or avoiding traffic accidents at speeds up to 30 km/h in vehicles using City Safety Generation I. Later models using City Safety Generation II can stop at 50 km/h .  All cars sold by Volvo Cars with a Model Year of 2014 or later is equipped with City Safety Generation II, with an exception of the XC90 (2002-2014).  City Safety is made by Volvo Cars.  The Volvo V40 was the first car to make use of City Safety Generation II when it was released 2012, and since then other cars in the line up has gotten the same system.  It uses lidar laser sensor that monitors an area approximately 6 m directly in front of the vehicle.  The feature is programmed to respond if the car in front is either at a standstill or is moving more slowly in the same direction as the car itself.  If City Safety determines a collision is unavoidable and the driver does not respond, it activates the vehicle's brakes and switches off the throttle.  If the relative speed between the two vehicles is 15 km/h or less, a collision may be avoided completely.  If the relative speed is above 15 km/h and up to approximately 30 km/h , the consequences of the collision may be reduced considerably.  Keep in mind that these values only applies to City Safety Generation I. Woomargama National Park is a national park situated 20 km south east of Holbrook and 30 km north east of Albury, in the South West Slopes region of southern New South Wales.  Southern extremities of the park are within one kilometre of Lake Hume which is formed on the Murray River.  The park extends over approximately 30 km from eastern to western boundaries and 15 km in a north to south direction.  In 2006, the park covered an area of 23,577 hectares and at the same time an area of associated reserve covered 7,120 hectares.  In 2010 the park alone covered 24,185 ha. Robert Johann Maria König (11 April 1885, Linz – 9 July 1979, Munich) was an Austrian mathematician. Guisande (] ) is a former civil parish in the municipality of Santa Maria da Feira, Portugal.  In 2013, the parish merged into the new parish Lobão, Gião, Louredo e Guisande.  It has a population of 1,474 inhabitants and a total area of 3.78 km².  Guisande is located approximately 30 km south of Porto and 320 km north from the capital city of Lisbon. Vlkov is a village and municipality ("obec") in Tábor District in the South Bohemian Region of the Czech Republic.  The municipality lies approximately 30 km south of Tábor, 28 km north-east of České Budějovice, and 106 km south of Prague.  It covers an area of 6.54 km2 , and has a population of 145 (as at 28 August 2006). The George Massey Tunnel (often referred to as the Massey Tunnel) is a highway traffic tunnel in the Metro Vancouver region of southwestern British Columbia.  It is located approximately 20 km south of the city centre of Vancouver, British Columbia, and approximately 30 km north of the Canada–United States border at Blaine, Washington. Ranila is a village in the Charkhi Dadri district of the Indian state of Haryana.  It lies approximately 30 km south east of the district headquarters town of Bhiwani.  As of the 2011 Census of India , the village had 1,927 households with a population of 10,199 of which 5,393 were male and 4,806 female.  The nearby villages are Bhageshwari 5 km, Sanjarwas 4 km, Pilana 2.5 km etc.
Answer: Czech border