Mirimidongguk was one of the 12 tribes or polities

Polity

Polity is a form of government Aristotle developed in his search for a government that could be most easily incorporated and used by the largest amount of people groups, or states...

 making up the Byeonhan confederation. It is mentioned in the San guo zhi, and is generally believed to have been located near the modern-day city of Miryang

Miryang

Miryang, often spelled Milyang, is a city in Gyeongsangnam-do Province, South Korea. Neighboring cities include Changnyeong to the west, Cheongdo to the north, Ulsan to the east, and Yangsan, Gimhae, and Changwon to the south. The city bird is the Korean magpie, the city tree is the pine, and the...

 in Gyeongsangnam-do

Gyeongsangnam-do

Gyeongsangnam-do is a province in the southeast of South Korea. The provincial capital is located at Changwon. It contains the major metropolitan center and port of Busan. Located there is UNESCO World Heritage Site Haeinsa, a Buddhist temple that houses the Tripitaka Koreana and attracts many...

, South Korea

South Korea

The Republic of Korea , , is a sovereign state in East Asia, located on the southern portion of the Korean Peninsula. It is neighbored by the People's Republic of China to the west, Japan to the east, North Korea to the north, and the East China Sea and Republic of China to the south...

.

Later Mirimidongguk was absorbed into Geumgwan Gaya

Geumgwan Gaya

Geumgwan Gaya , also known as Bon-Gaya or Garakguk , was the ruling city-state of the Gaya confederacy during the Three Kingdoms Period in Korea. It is believed to have been located around the modern-day city of Gimhae, Southern Gyeongsang province, near the mouth of the Nakdong River...

. By the early 6th century, it had fallen under the sway of Silla

Silla

Silla was one of the Three Kingdoms of Korea, and one of the longest sustained dynasties in...

; in 505, it was formally integrated into Silla as the county of Chuhwa-gun.