structural:summarization, information:filtering, linguistic:voice_change
Economy

Port Harcourt is a major industrial centre as it has a large number of multinational firms as well as other industrial concerns, particularly business related to the petroleum industry. It is the chief oil-refining city in Nigeria and has two main oil refineries located at Eleme. Both refineries process around 210,000 barrels of crude oil a day, both operated by the Port Harcourt Refining Company. Rivers State is one of the wealthiest states in Nigeria in terms of gross domestic product and foreign exchange revenue from the oil industry, crude oil being its principal export earner. Microapartment architecture is quite common in certain parts of Port Harcourt. The Point Block of Rivers State Secretariat is an icon of the city. An 18-story building, it is the tallest building in the South East and South South geopolitical zones combined.