Terra pericolosa is an Italian phrase meaning “dangerous land”. It was used in cartography to indicate areas on maps that might be dangerous to travelers. A commonly held but false belief is that dangerous areas on maps were marked with the Latin phrase for here be dragons: HIC SVNT DRACONES. In fact, only two documented examples of the use of that phrase on a map have been found (More: The Map Myth of Here Be Dragons). The most well known example is the Hunt-Lenox Globe (c. 1503–07) which incorporates the phrase near the east coast of Asia.
Stylistically, cartographers did incorporate fantastical beasts to indicate areas they felt were dangerous or uncharted. Ancient Roman and Medieval cartographers, however, did use the term HIC SVNT LEONES (Here are lions) to indicated unknown areas.
A similar term, Terra incognita (Latin for “unknown land” was used to mark areas on the maps that had not yet been documented. The term was first believed to have been used in Ptolemy’s Geography around 150 CE. The rediscovery of his work in the 15th century also resulted in the reintroduction of the phrase.