Question: What type of vegetation is in central area of the country where Massimo Baistrocchi lived?

full_context: Document 1: Sahara: To the north, the Sahara skirts the Mediterranean Sea in Egypt and portions of Libya, but in Cyrenaica and the Maghreb, the Sahara borders the Mediterranean forest, woodland, and scrub ecoregions of northern Africa, all of which have a Mediterranean climate characterized by hot summers and cool and rainy winters. According to the botanical criteria of Frank White and geographer Robert Capot-Rey, the northern limit of the Sahara corresponds to the northern limit of date palm cultivation and the southern limit of the range of esparto, a grass typical of the Mediterranean climate portion of the Maghreb and Iberia. The northern limit also corresponds to the 100 mm (3.9 in) isohyet of annual precipitation.
Document 2: Sahara: To the south, the Sahara is bounded by the Sahel, a belt of dry tropical savanna with a summer rainy season that extends across Africa from east to west. The southern limit of the Sahara is indicated botanically by the southern limit of Cornulaca monacantha (a drought-tolerant member of the Chenopodiaceae), or northern limit of Cenchrus biflorus, a grass typical of the Sahel. According to climatic criteria, the southern limit of the Sahara corresponds to the 150 mm (5.9 in) isohyet of annual precipitation (this is a long-term average, since precipitation varies annually).
Document 3: Sahara: The desert comprises much of North Africa, excluding the fertile region on the Mediterranean Sea coast, the Atlas Mountains of the Maghreb, and the Nile Valley in Egypt and Sudan. It stretches from the Red Sea in the east and the Mediterranean in the north to the Atlantic Ocean in the west, where the landscape gradually changes from desert to coastal plains. To the south, it is bounded by the Sahel, a belt of semi-arid tropical savanna around the Niger River valley and the Sudan Region of Sub-Saharan Africa.
Document 4: Nigeria: Everything in between the far south and the far north is savannah (insignificant tree cover, with grasses and flowers located between trees). Rainfall is more limited, to between 500 and 1,500 millimetres (20 and 60 in) per year. The savannah zone's three categories are Guinean forest-savanna mosaic, Sudan savannah, and Sahel savannah. Guinean forest-savanna mosaic is plains of tall grass interrupted by trees. Sudan savannah is similar but with shorter grasses and shorter trees. Sahel savannah consists of patches of grass and sand, found in the northeast. In the Sahel region, rain is less than 500 millimetres (20 in) per year and the Sahara Desert is encroaching. In the dry north-east corner of the country lies Lake Chad, which Nigeria shares with Niger, Chad and Cameroon.
Document 5: Massimo Teodori: Massimo Teodori (born 9 September 1938) is an Italian author and politician; his books mainly focus on the differences between Europe and the United States.
Document 6: Wahbi al-Bouri: Wahbi El-Bouri was an accomplished writer and is considered by many to be the father of the short story genre in Libya. He also wrote essays and other works of non-fiction on history and politics. He also translated a number of books in Italian about Libya. After his death Dr El-Bouri continued to be a character of inspiration for many Libyans to learn from his lifetime experience in Public Service as he served his country for almost 85 years and the numerous books he left behind, in 2011 after the Libyan uprising his family published his biography “Memories of my life”. In Jan 2017 El- Bouri’s grandson Zeid Basyouni and the El-Bouri family announced the establishment of the El-Bouri Foundation to continue Wahbi El-Bouri’s legacy as manifest in his great generosity of spirit which remained his trait up and aims to encourage and support young minds in the field of Writing, Literature, Public Service and Leadership.
Document 7: Geography of Nigeria: With the Intertropical Convergence Zone (ITCZ) swinging northward over West Africa from the Southern Hemisphere in April, heavy showers coming from pre-monsoonal convective clouds mainly in the form of squall lines also known as the north easterlies formed mainly as a result of the interactions of the two dominant airmasses in Nigeria known as the Maritime tropical (south westerlies) and the Continental tropical (north easterlies), begins in central Nigeria while the Monsoons from the south atlantic ocean arrives in central Nigeria in July bringing with it high humidity, heavy cloud cover and heavy rainfall which can be daily occurrence lasting till September when the monsoons gradually begin retreating southward to the southern part of Nigeria. Rainfall totals in central Nigeria varies from 1,100 mm (43.3 in) in the lowlands of the river Niger Benue trough to over 2,000 mm (78.7 in) along the south western escarpment of the Jos Plateau.
Document 8: Massimo Baistrocchi: Massimo Baistrocchi (August 17, 1942 – January 22, 2012) was an Italian writer, artist, freelance journalist and diplomat who served as Italy's Ambassador to Namibia from 2001 to 2004, as well as Ambassador to Ghana, Togo, Nigeria, and Benin.
Document 9: Namibia: Namibia is the driest country in sub-Saharan Africa and depends largely on groundwater. With an average rainfall of about 350 mm per annum, the highest rainfall occurs in the Caprivi in the northeast (about 600 mm per annum) and decreases in a westerly and southwesterly direction to as little as 50 mm and less per annum at the coast. The only perennial rivers are found on the national borders with South Africa, Angola, Zambia, and the short border with Botswana in the Caprivi. In the interior of the country surface water is available only in the summer months when rivers are in flood after exceptional rainfalls. Otherwise, surface water is restricted to a few large storage dams retaining and damming up these seasonal floods and their runoff. Thus, where people don’t live near perennial rivers or make use of the storage dams, they are dependent on groundwater. The advantage of using groundwater sources is that even isolated communities and those economic activities located far from good surface water sources such as mining, agriculture, and tourism can be supplied from groundwater over nearly 80% of the country.
Document 10: Chad: Chad has several regions: a desert zone in the north, an arid Sahelian belt in the centre and a more fertile Sudanian Savanna zone in the south. Lake Chad, after which the country is named, is the largest wetland in Chad and the second - largest in Africa. The capital N'Djamena is the largest city.
Document 11: János Hajnal: In Italy his artistic career was mainly based on glass walls and mosaics. He was granted Italian citizenship in 1958 due to his artistic merits.
Document 12: Geography of Nigeria: Nigeria, like the rest of West Africa and other tropical lands, has only two seasons. These are the dry season and the rainy season. The dry season is accompanied by a dust laden airmass from the Sahara Desert, locally known as Harmattan, or by its main name, The Tropical Continental (CT) airmass, while the rainy season is heavily influenced by an airmass originating from the south atlantic ocean, locally known as the south west wind, or by its main name, The Tropical Maritime (MT) airmass. These two major wind systems in Nigeria are known as the trade winds.
Document 13: Massimo Giustetti: Massimo Biella (28 February 1926 – 4 December 2012) was the Roman Catholic bishop of the Diocese of Biella, Italy.
Document 14: Massimo Bitonci: Massimo Bitonci (born 24 June 1965, in Padua) is an Italian Venetist politician. He is a member of Liga Veneta–Lega Nord, which he has served as national president since 2016.
Document 15: Stefano Missio: He has made various documentaries among which "When Italy was not a poor country", about Italy in the 1960s narrated by Joris Ivens, and "Scusi, dov'è il Nord Est?" produced by Fandango and On Line Productions for Arte (broadcast as "Succes à l'italienne") and broadcast in Italy by Tele+. In 2005 he directed "Il Ponte", a fiction short-movie, screenplayed by Francesco Tullio Altan, starring Carlo Mazzacurati and Valentina Fago. His last work, Che Guevara - The body and the legend (2007), was broadcast in 12 different countries. He works and lives in Paris.
ground_truth: savannah
sub_queries: In which country did Massimo Baistrocchi live? Answer: Nigeria
What type of vegetation is in central Nigeria ? Answer: savannah