The famous sayings praising the Yangtze River are as follows:

1. The rolling Yangtze River flows eastward, and the waves wash away the heroes. ——This is a famous line from "Linjiang Immortal: Rolling Waters of the Yangtze River Passing East" by Yang Shen, a writer of the Ming Dynasty. This sentence means that the water of the Yangtze River is rolling eastward, and in the tide of history, heroes appear and disappear like waves. It expresses the tragic and irresistible historical trend of heroic figures in the long history.

2. The great river goes eastward, and the waves are swept away, and there are romantic figures throughout the ages. ——This is a famous line from "Niannujiao·Chibi Nostalgia" written by Su Shi, a writer from the Song Dynasty. This sentence means that the water of the Yangtze River flows eastward, and countless romantic figures are eliminated in the tide of history. It expresses the author's feelings about historical changes and heroic figures.

3. The shadow of the lone sail in the distance is gone in the blue sky, and only the Yangtze River can be seen flowing in the sky. ——This is a famous line from the Tang Dynasty poet Li Bai's "Yellow Crane Tower Farewell to Meng Haoran at Guangling". This sentence means that the shadow of the friend's lone boat and sail gradually disappeared at the end of the blue sky, and only the Yangtze River was seen flowing toward the horizon. It expresses the poet's reluctance to leave his friends and the vast beauty of the Yangtze River.

4. If you don't see it, the water of the Yellow River will come up from the sky and rush to the sea never to return. ——This is a famous line from the Tang Dynasty poet Li Bai's "The Wine Will Come in". What this sentence means is, haven’t you (or I) seen people who are generous, sad and angry and have gray hair when justice and evil are treated fairly? It expresses the poet's feelings about the shortness of life and the passage of time.

5. As the sun fades over the mountains, the Yellow River flows into the sea. ——This is a famous line from "Climbing the Stork Tower" by Wang Zhihuan, a poet of the Tang Dynasty. This sentence means that the sun gradually sets behind the mountains and the Yellow River flows eastward towards the sea. It expresses the poet's admiration for the natural beauty and feelings about life.

The geographical characteristics of the Yangtze River Basin:

1. Huge water system and abundant runoff: The Yangtze River Basin has a huge water system, with a total length of about 6,300 kilometers in its main stream and a drainage area of ??about 1.8 million square meters. kilometers, accounting for 18.7 of China's land area. The total annual runoff in the Yangtze River Basin is approximately 995.8 billion cubic meters, accounting for 35% of the total river runoff in the country. This makes the Yangtze River Basin one of the most water-rich regions in China. The water system of the Yangtze River Basin provides important water resources for China's agriculture, industry, life and other fields.

2. Complex terrain and diverse climate: The terrain of the Yangtze River Basin is complex and diverse, high in the west and low in the east, with a total drop of 5,400 meters from the source to the mouth of the river. The basin includes various landform types such as mountains, plateaus, hills, and plains. This complex topography brings diverse climate types to the Yangtze River Basin. The upper reaches of the Yangtze River Basin has a plateau climate, the middle reaches have a subtropical monsoon climate, and the lower reaches have a subtropical humid climate. This climate diversity provides rich conditions for the ecological environment and biodiversity of the Yangtze River Basin.

3. Rich resources, fragile ecological environment: The Yangtze River Basin is one of the resource-rich regions in China. The basin is rich in water resources, water energy resources, land resources, mineral resources, etc. Especially the water energy resources in the Yangtze River Basin have theoretical reserves of up to 305,000 megawatts, accounting for 40% of the country's total water energy reserves. Due to long-term over-exploitation and environmental pollution, the ecological environment of the Yangtze River Basin is facing serious challenges. Problems such as soil erosion, water pollution, and biodiversity decline are becoming increasingly serious.