As an AI language model, I don’t have access to real-time data. However, based on the latest available information, the top 10 countries generating the highest revenue from land-based casinos include:

1. China (including Macau)
2. United States
3. Japan
4. South Korea
5. Singapore
6. Australia
7. Philippines
8. United Kingdom
9. Canada
10. Germany

Please note that this ranking can be subject to change as the casino industry is dynamic, and revenue figures can fluctuate annually.