Keelung is situated in the northern part of Taiwan with Keelung Islet and Hoping Island as its natural defense and the harbor faces the Pacific Ocean. Keelung is the largest natural port in northern Taiwan with the harbor area reaches deep into downtown, a rare case among all the harbor cities. As a result, the development of Keelung Harbor is closely related to the business development and scenery of the city.

The city is surrounded by mountains with the exception of the harbor reach of Keelung harbor, which is a wind gap.

　　Keelung City is divided into seven districts, which are Jhongjheng District, Sinyi District, Ren-ai District, Anle District, Nuannuan District and Cidu District. Among the seven districts, Cidu District accounts for 42.38% of the city and is considered the largest district while Ren-ai District is the smallest one. The city also has 7 islets, including Hoping Island, Jhongshanzih Islet, Tongpan Islet, Keelung Islet,Pengjia Islet, Mianhua Islet and Huaping Islet. Each district and islet has its unique natural landscape and culture.