What are the 10 biggest capital by the size of area please?

The ten largest capitals by area are:

1. Tokyo, Japan - Approximately 2,194 square kilometers.
2. Beijing, China - About 16,410 square kilometers.
3. Nairobi, Kenya - Roughly 696 square kilometers.
4. Bangkok, Thailand - Approximately 1,569 square kilometers.
5. Helsinki, Finland - Around 715 square kilometers.
6. Washington, D.C., USA - About 177 square kilometers.
7. Ottawa, Canada - Approximately 2,778 square kilometers.
8. Moscow, Russia - Roughly 2,511 square kilometers.
9. Brasília, Brazil - About 5,802 square kilometers.
10. Mexico City, Mexico - Approximately 1,485 square kilometers.

Note: The rankings and areas can vary based on definitions and administrative boundaries.