Why is Jinan a "Spring City"? Please tell me about the origin of "Quancheng".

Jinan, the capital of Shandong Province, is located in the middle and west of Shandong Province, bordering the Yellow River in the north and Mount Tai in the south. The city is located in a basin surrounded by mountains. County-level jurisdiction includes six districts of Shizhong, Lixia, Huaiyin, Tianqiao, Licheng and Changqing, three counties of Pingyin, Jiyang and Shanghe, and Zhangqiu. With a total area of 8,227 square kilometers and a population of 5.49 million, it is a famous historical and cultural city in China and an open coastal city. Jinan has a long history and is the birthplace of Longshan culture, a world-famous prehistoric culture. As early as 5,000 years ago, local residents were able to make black and shiny ceramics, which constituted the Longshan culture represented by black pottery in ancient China. There are many cultural relics here, including the Neolithic Longshan black pottery cultural site and the painted Luohan of Lingyan Temple in the Song Dynasty, which is known as the "first sculpture at sea". There are not only the oldest ground building in China-the tombstone of Xiaotangshan Guo in Han Dynasty, but also the oldest stone pagoda in China-Six Four-Gate Pagoda in Sui Dynasty. 2600 years ago, Qi built a city here, and Jinan became the frontier of Qi at that time. "Every household hangs poplars in spring water", "Lotus flowers on all sides and willows on three sides, and a city with mountains and lakes on half sides". It is the "Spring City" Jinan. This is the beautiful city, which is famous for its rich springs and beautiful scenery. There used to be hundreds of spring eyes in Jinan, including Baotu Spring, Black Tiger Spring, Wulongtan Spring and Pearl Spring, with more than 100 beautiful springs, enjoying the reputation of "seventy-two springs". Now that most famous springs have bottomed out, I don't know when I can see ripples again. Baotu Spring has the reputation of "the first spring in the world". Spray it three feet high and you'll never see it again. But to see the strange spring, there are many places in Yi 'an and Li Panlong, so you must go. In spring in Black tiger, it is also a pleasure to find a morning with few people, stroll by the spring, watch the spring eyes rise like beads, and listen to the leisurely running of the Black Tiger Spring. Daming Lake, Qianfo Mountain and Baotu Spring are also called the three famous scenic spots in Jinan. Daming Lake has a vast water surface and is formed by the confluence of springs. In summer, the lotus flowers on the lake reflect the sun, and the green willows are shaded. It's interesting to go to Daming on the Lotus Festival. Qianfo Mountain is a famous Buddhist mountain, which was called Mount Li in ancient times. It is said to be suitable for farming and Mount Li. When climbing a mountain, the lake is like a mirror, the Yellow River is like a belt, and the spring city is full of customs. You can go to Baotu Spring in spring and Daming Lake in winter. However, Leng Xia is hot in winter and windy and dusty in spring, and the best travel time is autumn.