The Tianyuan Continent is vast and intricate, bordering the Netherworld Sea to the north, the Dacang Mountain to the east, the Biluo Sea to the south, and the wind and smoke desert to the west. With Longmu Ridge as the boundary, the Ancient Tree Kingdom in Lingnan and the Tianlong Empire in Lingbei almost divided the eastern part of the Tianyuan Continent. As for the stronger winged human kingdom, beast kingdom, and lich kingdom to the west of the Falling Star Sea. Among them, the Winged People Kingdom is bordered by the Beast Country to the west, and the Beast Country and the Winged People Kingdom are the Lich Kingdom in the south. ......> the area of the three kingdoms is not much different, and the Lich Kingdom is long from east to west and narrow from north to south. Because the three countries border each other and have different customs and habits, there is constant friction between them. However, they have restrained each other and formed a three-legged situation. Due to the calendars of various countries, the measurement is quite different, and it is extremely inconvenient to trade with each other. Under the strong recommendation of the ancient tree country, the heads of state reached a consensus and entrusted the Yanyan country in the wind and smoke desert to formulate relevant standards. And the unified use of the "Tian Yuan Trade Currency and Measurement General Standards" published by it, the calendar gradually unified the "Tian Yuan Calendar", this era is set as the Tian Yuan Era.