Noun
Land that has never been explored or mapped; uncharted territory.
By extension, ideas or concepts that have not yet been tried or explored.
Source: en.wiktionary.orgD. (1682) "A short relation out of the journal of Captain Abel Jansen Tasman, upon the discovery of the South Terra incognita; not long since published in the Low Dutch". Source: Internet
Terra incognita and all that." citation Maps A Game of Thrones, the first installment of the A Song of Ice and Fire series, has two maps of Westeros. Source: Internet