Mono is subdivided into six communes, each centred at one of the principal towns, namely, Athiémè, Bopa, Comè, Grand-Popo, Houéyogbé and Lokossa.

It is located in a coastal area that has interconnected lakes and lagoons and elongated coastlines with wide marshes.

[2] The department has mostly low-lying sandy coastal plains towards the Atlantic Ocean, marshes, lagoons and lakes.

[3] Lokossa is the departmental capital; other major settlements include Athiémè, Bopa, Comè, Grand-Popo, Houéyogbé, Possotomè and Sè.

Petroleum was discovered in the 1960s in offshore areas, while titanium, low quality iron ore, ilmenite and chromite are the major minerals.

[4] According to Benin's 2013 census, the total population of Mono Department was 497,243, with 241,554 males and 255,689 females.

[5] The main ethnolinguistic groups in the department are the Aja, Fon, Gen, Phla (also known as Xwla), Saxwe, Phera (also known as Xwela), Kotafon] and Ayizo.

Mono is subdivided into six communes, each centered at one of the principal towns: Athiémè, Bopa, Comè, Grand-Popo, Houéyogbé and Lokossa.

A law passed in 1999 transformed the sous-prefectures, the lowest level of territorial administration, into local governments.