Question: The Sawaq language, sometimes also called "Ingelshi", is a northern Songhay language spoken by the "Issawaghan" (or "Ingalkoyyu"), a community surrounding Ingal in Niger, a closely related variety called Emghedeshie was spoken at which is the largest city in central Niger, with a population of 118,244 (2012 census), it lies in the Sahara and is the capital of Aïr?

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Sursilvan dialects (Romansh): Sursilvan ( ]  or "romontsch sursilvan" [ʁoˈmɔntʃ suʁsilˈvan]) is a group of dialects of the Romansh language spoken in the Swiss district of Surselva.  It is the most widely spoken variety of Romansh with 17,897 people within the Surselva District (54.8%) naming Romansh as a habitually spoken language in the Swiss census of 2000.  The most closely related variety is Sutsilvan, which is spoken in the area located to the east of the district.

Fula language: Fula , also known as Fulani or Fulah<ref name="ISO 639-2/RA"> </ref><ref name="ISO 639-3/RA"> </ref> (Fula: "Fulfulde, Pulaar, Pular"; French: "Peul" ), is a language spoken as a set of various dialects in a continuum that stretches across some 20 countries in West and Central Africa.  Along with other related languages such as Serer and Wolof, it belongs to the Senegambian branch within the Niger–Congo languages, which does not have tones, unlike most other Niger–Congo languages.  More broadly, it belongs to the Atlantic geographic grouping within Niger–Congo.  It is spoken as a first language by the Fula people ("Fulani", Fula: "Fulɓe" ) from the Senegambia region and Guinea to Cameroon and Sudan and by related groups such as the Toucouleur people in the Senegal River Valley.  It is also spoken as a second language by various peoples in the region, such as the Kirdi of northern Cameroon and northeastern Nigeria.

Sultanate of Agadez: The Sultanate of Agadez (also known as Tenere Sultanate of Aïr, Sultanate of Aïr) was a Berber kingdom centered in the city of Agadez in the Aïr Mountains, located at the southern edge of the Sahara desert in north central Niger.  It was founded in 1449 by the Tuareg.  The sultanate was later conquered by the Songhai Empire in 1500.  After the defeat of Songhai in 1591, the Agadez Sultanate regained its independence.  It experienced a steep decline in population and economic activity during the 17th century.  The kingdom was later conquered by the French in 1900.

Igdalen people: The Igdalen (var.: Igdalan, Agdal) are a Berber people inhabiting northwestern Niger and parts of Mali and Algeria.  They speak Tagdal, a mixed Tuareg–Songhay language.  The Igdalen are closely related to Idaksahak people of eastern Mali and the Sawaq of Ingal in Niger, with whom they share a very similar language.  Culturally, the Igdalen are often considered a Tuareg faction.  In the past they have formed a sub-confederation with the Kel Fadey, Kel Ferwan and others in the Kel Ayr Tuareg confederation or "Drum Group".

Tasawaq language: The Sawaq language (Tuareg name: "Tasawaq"), sometimes also called "Ingelshi", is a northern Songhay language spoken by the "Issawaghan" (or "Ingalkoyyu"), a community surrounding Ingal in Niger.  A closely related variety called Emghedeshie was spoken at Agadez, but is now extinct.

Daza language: Daza (also known as Dazaga) is a Nilo-Saharan language spoken by the Daza people inhabiting northern Chad.  The Daza are also known as the Gouran (Gorane) in Chad.  Dazaga is spoken by around 380,000 people, primarily in the Djurab Desert region and the Borkou region, locally called Haya or Faya-Largeau northern-central Chad, the capital of the Dazaga people.  Dazaga is spoken in the Tibesti Mountains of Chad (330,000 speakers), in the eastern Niger near N'guigmi and to the north (50,000 speakers).  It is also spoken to a smaller extent in Libya and in Sudan, where there is a community of 3,000 speakers in the city of Omdurman.  There's also a small diaspora community working in Jeddah, Saudi Arabia.  The two primary dialects of the Dazaga language are Daza and Kara, but there are several other mutually intelligible dialects, including Kaga, Kanobo, Taruge and Azza.  It is closely related to the Tedaga language, spoken by the Teda, the other out of the two Toubou people groups, who reside primarily in the Tibesti Mountains of northern Chad and in southern Libya near the city of Sabha.

Gadal language: The Gadal language (Tuareg name: "Tagdal") is a mixed Northern Songhay language of central Niger.  "Ethnologue" considers it a "mixed Berber–Songhay language", while other researchers consider it Northern Songhay.  About half of its daily vocabulary is Tuareg, and three quarters overall.  There are two dialects: Tagdal proper, spoken by the Igdalen people, pastoralists who inhabit a region to the east along the Niger border to Tahoua in Niger, and Tabarog, spoken by the Iberogan people of the Azawagh valley on the Niger–Mali border.

Zarma language: Zarma (also spelled Djerma, Dyabarma, Dyarma, Dyerma, Adzerma, Zabarma, Zarbarma, Zarma, Zarmaci or Zerma) is one of the Songhay languages.  It is the leading indigenous language of the southwestern lobe of the West African nation of Niger, where the Niger River flows and the capital city, Niamey, is located.  Zarma is second-most common language in the country, after Hausa, which is spoken in south-central Niger.  With over 2 million speakers, Zarma is easily the most widely common Songhay language.

Korandje language: Korandje (Korandje: "kwạṛa n dzyəy"; Arabic: البلبالية‎ , "al-Balbaliyyah " ‎ ) is a Northern Songhay language which is by far the most northerly of the Songhay languages.  It is spoken around the Algerian oasis of Tabelbala by about 3,000 people; its name literally means "village's language".  While retaining a basically Songhay structure, it is extremely heavily influenced by Berber and Arabic; about 20% of the 100-word Swadesh list of basic vocabulary consists of loans from Arabic or Berber, and the proportion of the lexicon as a whole is considerably higher.

Agadez: Agadez, formerly spelled Agades, is the largest city in central Niger, with a population of 118,244 (2012 census).  It lies in the Sahara and is the capital of Aïr, one of the traditional Tuareg–Berber federations.  The city is also the capital of the Agadez Region.  As of 2011, the urban commune had a total population of 124,324 people.

Supporting paragraphs: Tasawaq language Agadez
Answer: Agadez