What is the only country which is crossed by both the Equator and Tropic of Capricorn?

Brazil which lies between 6°N and 34°S has both the equator (0°) and Tropic of Capricorn (23.5°S) passing through it.

https://en.wikipedia.org/wiki/Geography_of_Brazil

Brazil is the only country crossed by both the equator and one of the tropics.

The Equator line crosses Brazil at the Northern region; the Tropic of Capricorn crosses the country at the Southeastern region.

https://www.bacctravel.com/about-brazil

Only the continents of South America and Africa cross both the equator and the tropics of Capricorn. No continent crosses both the equator and the tropics of Cancer. None of the countries in Africa are long enough to cross both lines. The only possible candidates that cross the tropics of Capricorn are Brazil, Argentina, Paraguay, and Chile. Of those only Brazil also crosses the equator.