Looking at the map, it is found (1) that Jinjiang, the mother river of Quanzhou, mostly originates from Dai Yun in Dehua County, Yongchun County and ① Anxi County, and flows southeast into Quanzhou Bay. (2) Judging from Figure 3, the dry season of Jinjiang in normal years is autumn and winter (season), and at this time, there is usually a serious seasonal water shortage in our city. Besides natural reasons, the main socio-economic reasons for the lack of water resources in this area are: developed economy and large population. (Answer at least two aspects) (4) Reading the map, it is found that rivers generally develop in which of the following topographic parts: river valleys. (5) Try to judge that the most suitable place for dam construction of this reservoir is located at C in A, B and C in the map.
So the answer is: (1) Anxi; Southeast; (2) autumn and winter seasons; (3) shishi city; Hui 'an County; Developed economy and large population; (4) a; ? (5)C。