Mombasa travels to the Swahili Coast and made some mention of the city, although he only stayed one night. He noted that the people of Mombasa were Shãfi'i Muslims, religious people, trustworthy and righteous. Their mosques are made of wood, expertly built. The exact founding date of the city is unknown, but it has a long history. Kenyan school history books place the founding of Mombasa as 900 A.D. It must have been already a prosperous trading town in the 12th century, as the Arab geographer Al Idrisi mentions it in 1151. The oldest stone mosque in Mombasa, Mnara, was built
Mombasa Mainland Desalination Plant 2018, the daily freshwater needed was , but prevailing sources could only supply . The MMDP is one of four desalination plants planned for construction in Mombasa County, to address the freshwater shortage. MMDP is being developed by "Almar Water Solutions", a Spanish company that specializes in the provision solutions to water-related issues, including infrastructure development, design, financing and operation. MMDP is the first to be developed, with construction planned to start in June 2019 and completion by January 2021. Other desalination plants in the pipeline include "Mombasa West Desalination Plant", located on the western side of Mombasa mainland, with