The equivalent on French maps would be terres inconnues (plural form), and some English maps may show Parts Unknown.
Terra Nova Expedition | Terra Australis | Aqui na Terra | Evo Terra | Terra Nova Bay | Terra Networks | Terra Foundation for American Art | Canto della Terra | terra cotta | Terra | A Voyage to Terra Australis | Void Terra Firma | Terra Sancta College | Terra Obscura | Terra-Gruppen | Terra Feminarum | Castrocaro Terme e Terra del Sole | ''Thérèse-Françoise Potain Roland, Wife of the Sculptor'', terra cotta | Terra Vnesa | Terra Sancti Benedicti | Terra preta | Terra Nova National Park | Terra (mythology) | Terra Museum | Terra Findlay | Terra di Bari | Terra del Sole | Terra de Caldelas | Terra Cotta | Terra Bella, California |
By the twenty-second century the entire world east of the 30th meridian west and west of the 175th meridian east has become terra incognita to Pan-America.
Kaikhosru Shapurji Sorabji wrote of this piece in 1932 that it was familiar ... — too familiar one is tempted to say, for most people think of Alkan, indeed only know him, as the composer of ‘Le Vent’, as they know only the Sibelius of the ‘Valse Triste’ or ‘Finlandia’; the great master of ‘Le festin d'Ésope’ and the Fourth Symphony respectively being completely a terra incognita.