Answer the following question: Information:  - North Africa or Northern Africa is the northernmost region of Africa. The United Nations definition of "North Africa" includes seven countries and territories; Algeria, Egypt, Libya, Mauritania, Morocco, Sudan, Tunisia, and Western Sahara. The countries of Algeria, Morocco, Tunisia, and Libya are often collectively referred to as the Maghreb, which is the Arabic word for "sunset". Egypt lies to the northeast and encompasses part of West Asia, while Sudan is situated on the edge of the Sahel, to the south of Egypt.  - Byrsa was the walled citadel above the harbour in ancient Carthage . It was also the name of the hill it rested on . The name is derived from the Phoenician word for citadel . In Virgil 's account of Dido 's founding of Carthage , when Dido and her party were encamped at Byrsa , the local Berber chieftain offered them as much land as could be covered with a single oxhide . Therefore , Dido cut an oxhide into tiny strips and set them on the ground end to end until she had completely encircled Byrsa . This story is considered apocryphal , and was most likely invented because Byrsa sounds similar to the Greek word  , meaning oxhide . The citadel dominated the city below and formed the principal military installation of Carthage . It was besieged by Scipio Aemilianus Africanus in the Third Punic War and was defeated and destroyed in 146 BC. Saint Louis Cathedral was built on Byrsa Hill starting in 1884 . Today , it serves as a cultural center . Today , the Byrsa , is part of the archaeological site of Carthage and in addition to the cathedral monument , has the Carthage National Museum built on it .  - The Mediterranean Sea (pronounced ) is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Southern Europe and Anatolia, on the south by North Africa, and on the east by the Levant. The sea is sometimes considered a part of the Atlantic Ocean, although it is usually identified as a separate body of water.  - Carthage (from ; Phoenician "" "New City") was the centre or capital city of the ancient Carthaginian civilization, on the eastern side of the Lake of Tunis in what is now the Tunis Governorate in Tunisia.  - Carthage (' "new city") was the Phoenician city-state of Carthage and during the 7th to 3rd centuries BC, included its sphere of influence, the Carthaginian Empire. The empire extended over much of the coast of North Africa as well as encompassing substantial parts of coastal Iberia and the islands of the western Mediterranean Sea.  - A city-state is a sovereign state that consists of a city and its dependent territories. Historically, this included cities such as Rome, Athens, Carthage, and the Italian city-states during the Renaissancebut today only a handful of sovereign city-states exist, with some disagreement as to which are city-states. A great deal of consensus exists that the term properly applies to Singapore, Monaco, and Vatican City.    Given the information, choose the subject and object entities that have the relation of 'country'.
Answer:
byrsa , tunisia