Sudan is a country and a country can not contain a country so your question is nonsense.
Up until 2011 Sudan had been the largest country in Africa. In July 2011 part of Sudan became independent to form a new country called the Republic of South Sudan, and making Sudan itself smaller. The result of this is that Algeria is now the largest country in Africa, and Sudan is now the third largest.
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The largest country in East Africa is Sudan.
Khartoum is the capital and largest city of Sudan.
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Well now that Sudan split into Sudan and South Sudan it is no longer the largest country in Africa making Algeria the new largest country in Africa
Democratic Republic of the Congo is the largest country in Africa as of July 9, 2011. When South Sudan split from Sudan, Sudan dropped to the 2nd largest country in Africa, 16th in the world (previous was 10th)
Africa's largest country is Sudan.
Algeria is larger than Sudan, Considering the fact that Sudan has split into South Sudan and Sudan