索约是非州南部国家安哥拉的城市，由扎伊尔省负责管辖，位于刚果河注入大西洋的河口处，海拔高度12米，是该国最大的石油生产区域，城内有机场设施，2010年人口估计约77,368。

Soyo (formerly known as Santo António do Zaire) is a city located in the province of Zaire in Angola, at the mouth of the Congo river. Soyo recently became the largest oil-producing region in the country, with an estimate of 1,200,000 barrels per day (190,000 m/d).