 The park abuts the city's port and industries including steel, shipbuilding, and petrochemicals.The people of Guangzhou once swam in the Pearl River but at its worst pollution has turned its waters black and putrid.In 2009–10, municipal leaders spent $6,000,000,000 on treatment and a massive refinery (a joint venture between Sinopec and the Kuwait Petroleum Co.) was relocated out of Nansha District, which municipal planners aim to make 50% forest, grass, or wetlands.