1. A territory or region that has not been explored, mapped, or is unfamiliar to people
The explorers ventured into unknown land seeking new discoveries.
Os exploradores se aventuraram em terra desconhecida em busca de novas descobertas.
2. A figurative reference to an unfamiliar or uncertain situation or subject
Starting a new business was unknown land for him.
Iniciar um novo negócio era terra desconhecida para ele.