Slide showing a photograph of the road heading to Mandeville and Porous. On the road is a man with a tripod. Mandeville is the capital and largest town in the parish of Manchester in the county of Middlesex, Jamaica. Porus is a village in Manchester, Jamaica.. Part of Box 108. Boswell Collection. Slide number 37. Jamaica, officially the Commonwealth of Jamaica, is an island nation of the Greater Antilles, situated in the Caribbean Sea. Jamaica is south of Cuba and west of Hispaniola, the island containing the nation-states of Haiti and the Dominican Republic in the West Indies.