Question: Abdelhamid Abou Zeid in 2012 took control of an ancient city in Mali, situated 20 km north of what river?

Context paragraphs:
Pressath: Pressath is a municipality in the district of Neustadt (Waldnaab), in Bavaria, Germany.  Pressath was founded in 1657.  It is situated 20 km northwest of Weiden in der Oberpfalz and ca. 7 km north of Grafenwöhr.

Abdelhamid Abou Zeid: Abdelhamid Abou Zeid (born Mohamed Ghadir; 1965 – 25 February 2013) was an Algerian national and Islamist "jihadi" militant and smuggler who, in about 2010, became one of the top three military commanders of al-Qaeda in the Islamic Maghreb (AQIM), a Mali-based militant organization.  He competed as the chief rival of Mokhtar Belmokhtar, an Algerian national who had become the major commander in AQIM and later head of his own group.  Both gained wealth and power by kidnapping and ransoming European nationals.  After taking control of Timbuktu in 2012, Abou Zeid established "sharia" law and destroyed Sufi shrines.

Tripolis on the Meander: Tripolis on the Meander (Greek: Τρίπολις, "Eth."  Τριπολίτης , Latin: "Tripolis ad Maeandrum" ) – also Neapolis, Apollonia, and Antoninopolis – was an ancient city on the borders of Phrygia, Caria and Lydia, on the northern bank of the upper course of the Maeander, and on the road leading from Sardes by Philadelphia to Laodicea ad Lycum.  (It.  Ant.  p. 336; Tab.  Peut. ) It was situated 20 km to the northwest of Hierapolis.

Döşemealtı: Döşemealtı is a municipality and district governorate in Greater Antalya, Turkey.  Antalya is one of the 30 metropolitan centers in Turkey with more than one municipality within city borders.  Now in Antalya there are five second-level municipalities in addition to Greater Antalya ("büyükşehir") municipality.  Döşemealtı is actıually situated 20 km north of city center on the Turkish state highway D-650 at .  According to 2012 figures the urban population of Döşemealtı is 32465 Together with rural area the total population is 47497.  The name of the city refers to ancient road around the town (In Turkish "Döşeme" means "pavement" ) Döşemealtı is a recent settlement.  The earlisest residents were from Korkuteli (Burdur Province) in 1934.  Later people from Cyprus and Yörüks (nomadic Turkmens) were also settled in Döşemealtı.  It was declared as seat of township in 1972 and a district center within Greater Antalya in 1998.

Aulendorf: Aulendorf (   ) is a town in the district of Ravensburg, in Baden-Württemberg, Germany.  It is situated 20 km southwest of Biberach an der Riß, and 19 km north of Ravensburg.

Timbuktu: Timbuktu (pron.: ), also spelled as Tinbuktu, Timbuctoo and Timbuktoo (Berber: ;French: "Tombouctou" ; Koyra Chiini: "Tumbutu"), is an ancient city in Mali, situated 20 km north of the Niger River.  The town is the capital of the Timbuktu Region, one of the eight administrative regions of Mali.  It had a population of 54,453 in the 2009 census.

Riedbach: Riedbach is a municipality in the district of Haßberge in Bavaria in Germany.  It is situated 20 km northeast of Schweinfurt and 8 km north of Haßfurt.

Tourism in Punjab, Pakistan: Punjab is the second largest province in Pakistan.  It is known for its ancient cultural heritage as well as its religious diversity.  The lands of Punjab have been home to a number of religions and civilisations.  The Indus Valley Civilization once ruled the region and a significant archaeological find was discovered at the ancient city of Harrapa.  The Gandhara civilisation was also quite dominant in the northern region of Punjab at the site of Taxila.  Several other civilisations such as Greeks, Central Asians, and Persians ruled Punjab leaving a number of sites which still exist today.  The arrival of Islam came about during the rule of the Umayyad Caliphate followed by the Ghaznavids.  The Mughals took control of the region and ruled its land for several centuries.  The mughal heritage remained quite strong in Punjab with a large number of forts, tombs and monuments still intact today.  The Durrani Empire ruled the Punjab at the fall of the Mughal Empire for a short period following the rise of the Sikh Empire.  The strong control of the Sikhs also lead to a number of sites still remaining intact throughout Punjab.  The British Raj took control of the region until the independence.

Terina (ancient city): Terina (Ancient Greek: Τερίνα ) was an ancient city of Magna Graecia on the north shore of the Gulf of Saint Euphemia, about 20 km from Lamezia Terme in Calabria.  The site of the city was allegedly found in 1922 by the archaeologist Paolo Orsi near the modern village of Sant'Eufemia Vetere, but a systematic archaeological investigation was only started in 1997 and it is only based on coins found there.  Coins, inscriptions and other artefacts retrieved from the site can be seen in the Museo Archeologico Lametino in Lamezia Terme.  However, the actual collocation of the ancient city is in Nocera Terinese where the original location is situated on top of a hill called Piano di Tirena.  This hill is surrounded by two rivers merging, Savuto and Grande, and it perfectly matches the description provided by the Greek historian Strabo in his major work Geographica, which was first published around 20 AD.

Woomargama National Park: 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.

Supporting paragraphs: Abdelhamid Abou Zeid Timbuktu
Answer: Niger River