What is "kayes"

Kayes ( Bambara: Kayi, Soninké: Xaayi) is a city in western Mali on the Sénégal River, with a population of 127,368 at the 2009 census. Kayes is the capital of the administrative region of the same name. The name "Kayes" comes from the Soninké word "karré", which describes a low humid place that floods in rainy season. The city is located northwest of the capital Bamako.