Algeria is on Earth.
Africa is the world 's second-largest and second-most-populous continent . Algeria is Africa 's largest country by area , and Nigeria by population . Algeria ( الجزائر ; ⴷⵣⴰⵢⴻⵔ , Dzayer ; Algérie ) , officially the People 's Democratic Republic of Algeria , is a sovereign state in North Africa on the Mediterranean coast . With an area of 2381741 km2 , Algeria is the tenth-largest country in the world , and the largest in Africa .