Question: How many kilometers southwest of Geneva's city centre is Doyen Bridel from?
Context: Iro Lake (French: "Lac Iro" ) is a cyclically occurring lake in the Moyen-Chari Region in southeastern Chad.  It is fed in the summer and autumn months from the eastern arm of the Bahr Salamat, which forks seven kilometers southwest of the lake.  The lake is about 100 kilometers north of the border with the Central African Republic.  It is nearly circular, 13 kilometers long and 11 kilometers wide.  During the dry season it can completely run dry. Mago National Park is one of the National Parks of Ethiopia.  Located in the Southern Nations, Nationalities, and Peoples' Region about 782 kilometers south of Addis Ababa and north of a large 90° bend in the Omo River, the 2162 square kilometers of this park are divided by the Mago River, a tributary of the Omo, into two parts.  To the west is the Tama Wildlife Reserve, with the Tama river defining the boundary between the two.  To the south is the Murle Controlled Hunting Area, distinguished by Lake Dipa which stretches along the left side of the lower Omo.  The park office is 115 kilometers north of Omorate and 26 kilometers southwest of Jinka.  All roads to and from the park are unpaved. Agios Stefanos is a village within the Lasithi prefecture in eastern Crete.  It belonged to the former province of Siteia until that was abolished in 2006.  Between 1997 and 2010, it was part of the former Makry Gialos municipality.  Today, it is part of Ierapetra municipality.  It is located 30 kilometers north-east of Ierapetra, 40 kilometers southwest of Sitia, and six kilometers east of Stavrohori.  It can be approached through the famous forest of Pefkoseli.  Its patron is Saint Stephen.  Saint Stephen church, at the entrance of the village, is an ecclesiastical and historical monument of Crete.  The village's previous name was Gras.  Since the last decade, the majority of the population has been moved to the village's seaside settlement of Makry Gialos, some six kilometers to the south.  Makry Gialos is one of Crete's most important tourist resorts. The Palmason Model is a depth, distance, temperature and heat flow gradient model of crustal accretion mechanism through the Iceland lithosphere which denotes the spreading material trajectories from a rift axis.  The material erupting at the rift axis will tend to sink down, due to thermal subsidience and spreading, to a depth of many kilometers, while lava flows spreading to a distance of many kilometers away from the rift axis on the surface will sink down to shallower depth.  Surface erosion can expose such preserved materials. Ma'arrat Misrin (Arabic: معرة مصرين‎ ‎ , also spelled Ma'arrat Masrin or Ma'aret Masreen) is a small city in northwestern Syria, administratively part of Idlib Governorate.  Ma'arrat Misrin lies an elevation of 338 m .  It is located 50 kilometers southwest of Aleppo and 40 kilometers north of Ma'arrat al-Numan and 12 kilometers from Sarmin.  Nearby localities include Kafr Yahmul to the north, Zardana and Maarrat al-Ikhwan to the northeast, Taftanaz to the east, Ta'um, Binnish, al-Fu'ah and Kafriya to the southeast, Idlib to the south, and Hafsarjah to the southwest. Thalassia (Greek: Θαλασσιά , previously known as "Denizli") is a settlement in the Xanthi regional unit of Greece.  It is part of the community Toxotes.  It is located 4 kilometers southwest of Toxotes and 15.8 kilometers southwest of Xanthi.  In 1991, the population of Thalassia was around 365 inhabitants. Philippe-Sirice Bridel (also "Philippe Cyriaque"), known as le Doyen Bridel (born 20 November 1757 in Begnins, Bernese "Vogtei" of Nyon, died 20 May 1845 in Montreux, canton of Vaud, Swiss Confederation) Koiliomenos (Greek: Κοιλιωμένος , also known as Agios Nikolaos) is a settlement on Zakynthos island, Greece.  It is located 3 kilometers southwest of Machairado and 11 kilometers southwest of Zakynthos City.  In 1981, the population of Koiliomenos was around 463 inhabitants.  In 1991, the population declined slightly to around 450 inhabitants. Heshun Town () is an ancient town in Tengchong City, located four kilometers southwest of the city centre in Yunnan, China.  The town's ancient name is Yangwendun () which was changed to Heshun () and eventually the name it bears today.  Heshun is well known for its quadrangle courtyards that have been built into the town's hills. Nyon ] is a municipality in the district of Nyon in the canton of Vaud in Switzerland.  It is located some 25 kilometers north east of Geneva's city centre, and since the 1970s it has become part of the Geneva metropolitan area.  It lies on the shores of Lake Geneva and is the seat of the district of Nyon.  The town has (as of December 2016 ) a population of .  It is connected to the rest of Switzerland by way of the Route Suisse, the A1 Motorway and the railways of the "Arc Lémanique".
Answer: 25