Swahili language
The exact number of Swahili speakers, be it native or second-language speakers, is unknown and a matter of debate. Various estimates have been put forward and they vary widely, from 50 million to over 100 million. Swahili serves as a national language of four nations: Tanzania, Kenya, Uganda, and the DRC. Shikomor, the official language in Comoros and also spoken in Mayotte (), is related to Swahili. Swahili is also one of the working languages of the African Union and officially recognised as a lingua franca of the East African Community. South Africa legalized the teaching of Swahili in South African schools as an optional subject beginning in 2020.
Swahili coast
The Swahili Coast is a coastal area in Southeast Africa inhabited by the Swahili people. It mainly consists of littoral Kenya, Tanzania, and northern Mozambique. The term may also include some of the Indian Ocean islands, such as Zanzibar, Pate and Comoros, which lie off the Swahili Coast. The Swahili Coast has a distinct culture, demography, religion and geography, and as a result - along with other factors, including economic - has witnessed rising secessionism.