Periphery
Sudan is a country on the continent of Africa
Sudan is a country and a country can not contain a country so your question is nonsense.
I think it is a core country.
According to world systems theory, Mexico is a semi-periphery country, which means it is an industrializing, mostly capitalist country positioned between the periphery and the core countries. In this case, it lies between the United States and the rest of Latin America.It is also not part of the core countries (US, Canada, Western Europe, Japan) and it is not part of the periphery or less developed countries (most of Africa, South America or Southeast Asia).It is a gateway or semi-periphery country because it acts as a bridge or link between both worlds.
Sudan
Sudan is a country.
If it is south Sudan then north Sudan but if it is north Sudan, It is Eygpt.
Sudan is neither a developed or a developing country. Sudan is a country in chaos.
The world's newest country is South Sudan, which gained independence from Sudan on July 9, 2011.
Sudan
Sudan is not in a country; it is a country. It is located in northeast Africa, bordering Egypt to the south.