34 S 18 E is in the South Atlantic Ocean. The nearest land appears to be Edinburgh of the Seven Seas. Which is the main settlement of the island of Tristan da Cunha, in Saint Helena, Ascension and Tristan da Cunha, an overseas territory of the United Kingdom, in the South Atlantic Ocean.
It is in the Southern Hemisphere, and in the Western Hemisphere. The coordinates of Tristan da Cunha are 37.1052° S, 12.2777° W.