Most lower-middle and upper middle income neighbourhoods are located in the north-central areas such as Highridge, Parklands, Ngara, Pangani, and areas to the southwest and southeast of the metropolitan area near the Jomo Kenyatta International Airport. The most notable ones include Avenue Park, Fedha, Pipeline, Donholm, Greenfields, Nyayo, Taasia, Baraka, Nairobi West, Madaraka, Siwaka, South B, South C, Mugoya, Riverbank, Hazina, Buru Buru, Uhuru, Harambee Civil Servants', Akiba, Kimathi, Pioneer, and Koma Rock to the centre-east and Kasarani to northeast area among others. The low and lower income estates are located mainly in far eastern Nairobi. These include, Umoja, Kariokor, Dandora, Kariobangi, Kayole, Embakasi, and Huruma. Kitengela suburb, though located further southeast, Ongata Rongai and Kiserian further southwest, and Ngong/Embulbul suburbs also known as 'Diaspora' to the far west are considered part of the Greater Nairobi Metropolitan area. More than 90% of Nairobi residents work within the Nairobi Metropolitan area, in the formal and informal sectors. Many Somali immigrants have also settled in Eastleigh, nicknamed "Little Mogadishu".