Bona, seaport town of Constantine in Algeria, on a bay of the Mediterranean, near the mouth of the Sebus, 220 m. W. of Tunis. The town, which lies at the foot of a hill in a beautiful but unhealthy district, is divided into Upper and Lower Bona, and is defended by a citadel and several forts. The French occupation has much improved Bona, which has now a fair harbour. There is a telegraph cable to Marseilles. There are a Catholic church and a convent of Sisters of Mercy. There are manufactures of saddlery, tapestry, and burnooses and a commerce in coral, corn, hides, wax and wool. Near by are the ruins of Hippo, the see of St. Augustine.