There are no Spanish-speaking countries in Australia. There are no other countries in Australia apart from Australia. It is a single country on one continent. Although the Portuguese are believed to have been the first to discover the continent, they did not colonise it. Thus, Australia is an English-speaking country.
Africa (and the spanish-speaking country is Equatorial Guinea).
Europe.
Mexico is the largest Spanish speaking country.
Africa has only one Spanish speaking country, which is Equatorial Guinea.
There is no Spanish countries in Africa.
Yes, there are Spanish speaking countries in Europe. Spain is a Spanish speaking country. Also the language of Portugal is Portuguese which is very closely related to Spanish.
Unfortunately, this question is too broad, because there are Spanish-speaking countries on every continent of the world except Australia. Almost every type of animal on Earth has a species living in Spanish speaking countries.
The only Spanish-speaking country with a communist government is Cuba.
There are 10 Spanish speaking countries in South America:ArgentinaBoliviaChileColombiaEcuadorEl SalvadorParaguayPeruUruguayVenezuela
The only country in Africa where Spanish is an official language--or at least spoken by a large segment of the population--is Equatorial Guinea.
Spain is the only Spanish-speaking country in Europe.