Say is a department of the Tillabéri Region in Niger. Its capital city is Say, and includes the towns of Guéladjo, Tamou, and Torodi. It abuts the urban Region of Niamey, and lies across the Niger River to the southwest of the capital. It extends to the Burkina Faso border over 60 km to the west, and the northernmost border with Benin in the south. The Say area is today divided between the riverine valley in the east of the Department, and the more sparsely populated areas to the west, which are intercut with a series of eastward flowing tributaries. The Niger river, a broad shallow channel at Niamey and at Say, passes through a series of gorges and cataracts, called the "W" bend for the shape the river takes, in the south of the Say Department. To the west of these rapids lies what is now the W Regional Park, a sparsely populated area historically plagued by insect borne diseases of both humans and cattle. Now a park and tourist attraction, its history as a "no mans land" has made it a refuge for remaining wild animals, as well as several undisturbed archeological sites. From at least the 16th century CE, the Zarma people moved south into this area from the northern plateau around what is now Oullam. The inhabitants at the time were related to the Gourma people, who form most of the population of the northwestern part of the Department today.