Map of the Roman Empire - Thapsus

Thapsus
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Ancient Thapsus - A maritime city on the eastern coast of Byzaoene located in the Roman province of Africa Propria, where Julius Caesar defeated the Pompeians (Scipio and Juba), 46 B.C., and finally ended the civil war and consolidated his power.

Thapsus (Θάψος). A city on the eastern coast of Byzacena, in Africa Propria. Here Caesar finally defeated the army of Pompey and ended the Civil War. See Caesar; Pompeius.

Thapsus (less commonly, Tapsus) was an ancient city in what is modern day Tunisia. Its ruins exist at Ras Dimas near Bekalta, approximately 200 km southeast of Carthage. Originally founded by Phoenicians, it served as a marketplace on the coast of the province Byzacena in Africa Propria. Thapsus was established near a salt lake on a point of land eighty stadia (14.8 km) from the island of Lampedusa. In 46 BC, Julius Caesar defeated Metellus Scipio and the Numidian King Juba with a tremendous loss of men near Thapsus (see Battle of Thapsus). Caesar exacted a payment of 50,000 sesterces from the vanquished. Their defeat marked the end of opposition to Caesar in Africa. Thapsus then became a Roman colony.

Thapsus, I. a maritime town of Byzaoene, bet. Leptis Min. and Turris Hannibalis. The locality of the defeat of Scipio and Juba by Caesar. - Classical Gazetteer

Thapsus
THAPSUS (Θάψος, Ptol. 4.3.10), a maritime city of Byzacium, in Africa Propria. It lay on a salt lake, which, according to Shaw (Trav. p. 99), still exists, and on a point of land 80 stadia distant from the opposite island of Lopadussa. Thapsus was strongly fortified and celebrated for Caesar's victory over the Pompeians, B.C. 46. (Hirt. B. Af. 28, seq.) Shaw (l.c.) identifies it with the present Demass, where its ruins are still visible. (Cf. Strabo, xvii, pp. 831, 834; Liv. 33.48; Plin. Nat. 5.4. s. 3, &c.)  - Dictionary of Greek and Roman Geography (1854) William Smith, LLD, Ed.