Across
- 3. Hungarian county with non-rectangular flag
- 8. Continent with the highest average elevation
- 10. Largest landlocked country
- 13. Nation once adopted a single colour flag
- 14. Country with non-quadrilateral shaped flag
- 16. Most inaccessible county in Eurasia
- 18. Municipality with 22 exclaves/enclaves
- 19. Former name of Seoul
- 20. Country with most time zones
- 21. Short version of longest official city name
Down
- 1. Country with oldest adoption of current flag design
- 2. Volcano close to San Pedro de Atacama
- 4. Shares a 150m border with Zambia
- 5. Capital closest to the equator
- 6. A 15th-century Inca citadel
- 7. Most tree flora diverse country
- 9. Longest train ride
- 11. Tallest uninterrupted waterfall
- 12. Operator of longest domestic flight
- 15. Island state without a capital city
- 17. Deepest subglacial lake