In the world of Monster Hunter, there are various areas that share similar features and environments. These are known as the Old and New variants. They are mainly seperated by familiarity. The Old variants, like the Old Swamp and the Old Jungle, have been explored and traversed through for years, making them extremely well known and predictable. The New variants, Like the New Swamp and New Jungle have only been discovered recently, so much of them have not been explored and remain unpredictable.