Dear Aspirant, seems that you want to pursue a career in the field of Geography. It is really a great and interesting career, where one can satisfy the hunger of job and in some cases this career as geography also earn a lot.
Let me tell you something about Geography, It is a branch of science, which deals with the study of lands, the features, the inhabitants, and the internal phenomena of the earth. Person who study the geography is known as Geographer. A geographer study the spatial and temporal distribution of phenomena, processes and features as well as the interactions of humans with the environment in which they live. Geography as a discipline can be divided into two subsidiary fields, as Human geography and Physical geography. The former largely focuses on the built environment and how humans built, create, view, manage and influence space. While the latter deals and examines the natural environment and how organisms, climate, soil, water and landforms produce, created and interact. The difference between these two approached led to the third field known as Environmental Geography, which combines the physical and human geography and looks or study the interactions between the environment and humans. .
You have asked for top 10 college in the world. But let me tell you about top 20 universities for geography in the world. The reason is that the top colleges are a part of top university. By getting admission in any one listed below, you can achieve the dream of joining any top college of the world.
The list is as follows:
1. University of Oxford, United Kingdom
2. University of California, Barkley (UCB), USA
3. University of Cambridge, (United Kingdom
4. University of California (Los Angeles), (UCLA), USA
5. London School of Economics and Political Sciences (LSE), United Kingdom
6. National University of Singapore (NUS), Singapore
7. The University of Tokyo, Japan
8. The University of British Columbia, Canada
9. Australian National University, Australia
10. University of Chicago, USA
11. University of Toronto, Canada

12. The University of Manchester, United Kingdom
13. Durham University, United Kingdom
15. University of Wisconsin-Madison, USA
16. University College, London (UCL)
17. University of Edinburgh, United Kingdom
18. McGill University, Canada
19. University of Washington, USA
20. Lund University, Sweden

Good Luck.....