Answer :
The correct option is desert
Nigeria is located in North Africa in the Gulf of Guinea and has a total area of 923,768 km², which makes it the 32nd largest country in the world (after Tanzania). It is comparable in size to Venezuela. It shares 4047 kilometers of border: 773 km with Benin, 1497 km with Niger, 87 km with Chad, 1690 km with Cameroon and has a coastline of around 853 km.
Nigeria's main rivers are the Niger and Benue that converge and flow into the Niger Delta, the largest in the world. The relief of Nigeria is dominated by the valleys of these rivers in the shape of "Y", the coastal plain is formed by fluvial contributions and its width varies between 20 and 100 km, to the north the land goes down in the direction of the Miada region and Lake Chad, which are only 250 m above sea level and whose shores constitute a swampy region. The highest point of Nigeria is Chappal Waddi with 2,419 m, located in the southeast, near the border with Cameroon, further north the Bauchi plateau, of granite character, which connects with the great highland system of Niger and Chad and that in some of its points like the Murchison mountains, they exceed 2,000 meters.