2. Silk Road, the oldest trade route between East and West in the world.

3. The largest city wall in the world-Shicheng, Nanjing in Ming Dynasty.

4. The world's tallest Tropic of Cancer sign tower-Guangdong Conghua North Return Sign Tower.

Huma County, Heilongjiang Province is the northernmost area of rice cultivation in the world.

6. The most famous tidal bore in the world-Qiantang River Tide.

7. The world's largest meteorite shower and meteorite landed in Jilin Province.

8. Guangxi Lingqu, the driest sluice canal in the world.

9. The Beijing-Hangzhou Grand Canal, the longest canal in the world.

10. The Yellow River, the river with the largest sediment concentration in the world.

1 1, the highest river in the world-Yarlung Zangbo River.

12, the largest saltwater lake in the world-Namco Lake in Tibet.

13, Himalayas, the highest mountain range in the world.

14, Tibet, the highest agricultural planting area in the world.

15, Taklimakan Desert, the desert with the largest proportion of mobile sand dunes in the world.

16, the lowest basin in the world-Turpan basin in Xinjiang.

17, the largest land elevation difference in the world-Mount Everest (8844.43) and Lake Aiding (155 m).

18. The most developed lava landforms in the world-Guangxi, Guizhou and eastern Yunnan.

19, the largest loess landform in the world-China Loess Plateau.

20. Qinghai-Tibet Plateau, the highest and youngest plateau in the world.