1911 Encyclopædia Britannica, Volume 18… (1911)
“ There are no springs and the island is dependent for water on rain collected in tanks or drawn from wells—the latter brackish. Ruins of Arab, Portuguese and Turkish buildings are found in various parts of the island. At Ras Serani are the ruins of a chapel “Nossa Senhora das Merces,” built by the Portuguese in the 17th century on the site of a Turkish fort, and afterwards turned into a fort again by the Arabs. Mombasa takes its name from Mombasa in Oman. A Perso-Arabic settlement was made here about the 11th century. ”
