Iro Lake is a cyclically occurring lake in the Moyen-Chari Region

Moyen-Chari Region

Moyen-Chari is one of the 22 regions of Chad and its capital is Sarh. Its economy is based on subsistence agriculture, breeding, cotton and sugarcane.-Demography:The region's population was 598,284 inhabitants in 2009 ....

 in southeastern Chad

Chad

Chad , officially known as the Republic of Chad, is a landlocked country in Central Africa. It is bordered by Libya to the north, Sudan to the east, the Central African Republic to the south, Cameroon and Nigeria to the southwest, and Niger to the west...

. It is in the summer and autumn months from the eastern arm of the Bahr Salamat

Bahr Salamat

Bahr Salamat is an intermittent river in Chad. It flows south into the Chari River. The river flows, when it does, through the community of Am Timan and through the a protected area, the Bahr Salamat Faunal Reserve. It flows with water....

 feded, which forks seven kilometers southwest of the lake. The lake is about 100 kilometers north of the border with the Central African Republic

Central African Republic

The Central African Republic , is a landlocked country in Central Africa. It borders Chad in the north, Sudan in the north east, South Sudan in the east, the Democratic Republic of the Congo and the Republic of the Congo in the south, and Cameroon in the west. The CAR covers a land area of about ,...

. It is nearly circular, 13 kilometers long and 11 kilometers wide. During the dry season it can completely run dry.