The most likely country that could be referred to as having no capital is Vatican City (in the centre of Rome, Italy) because the whole country (0.44 sqkm) is it's own city. Nauru also has no capital because it lacks any sizable population. However, most its leadership governs from the Yaren District. Switzerland is probably the biggest country with no official capital because of "De jure". Bern is the de facto capital while Zurich is the largest city in the country.
Some other countries that have the same capital name as the country are:
Djbouti (Africa)
Luxembourg (Europe)
San Marino (Europe)
Panama (Central America)
Singapore (Asia)
Monaco (Europe)
Countries have capitals cities. They do not have capital countries.
You will find a list of countries and their capital cities in the link below. You can arrange the list in alphabetical order of the countries' names or capital cities' names.
No country is the capital of Asia. First, Asia is a continent with many countries. Second, a capital is a city, not a country. As Asia is not a country, then it does not have a capital city. The countries in Asia would each have their own capital cities, but there is no one city that is the capital of Asia.
Colombia's capital city is Bogotá.
That is the capital and largest city in Nepal.
Manila is the capital of the Philippines.
Managua is the capital city of Nicaragua.
Quito is the capital city of Ecuador.
The capitals of the countries that border South Africa are: Namibia - capital is Windhoek. Swaziland - capital is Mbabane Botswana - capital is Gaberone Lesotho - capital is Maseru Zimbabwe - capital is Harare Mozambique - capital is Maputo
There are no countries in Canberra. It is a city, the capital of Australia.
There are no countries in Antarctica.
Vienna is the capital and largest city of Austria.