Terra incognita (abbreviated TI) is latin for "unknown land"; in Europa Universalis II, it is used to describe all provinces (include sea zones) which a country has not yet discovered. A particular province not discovered by a country is, to it, an unknown province. A related concept is an unknown country: when the capital province of a country is terra incognita to a second country, the first country is unknown to the second. A country's maps are the inverse of its terra incognita: maps are the set of known provinces.