Korean Peninsula

Lore & Background

The Korean Peninsula extends southward from the northeastern Asian mainland, bordered to the north by China and to the northeast by Russia, separated by the Amnok (Yalu) and Duman (Tumen) rivers. To the southeast, the Korea Strait separates it from Japan. The region includes the peninsula itself, Jeju Island, and numerous smaller islands. Politically, the peninsula is divided near the 38th parallel into two sovereign states: the Democratic People’s Republic of Korea (North Korea) in the north and the Republic of Korea (South Korea) in the south, a division established after World War II in 1945 and solidified by the Korean War (1950–1953), which ended in an armistice without a peace treaty. A demilitarized zone now approximates the original partition line. The peninsula’s defining characteristic is this ongoing political division, which sustains high tensions; South Korea claims to be the sole legitimate government of the entire region. Human habitation dates to around 40,000 BC. Historically, the peninsula was unified under various dynasties, including Gojoseon, the Three Kingdoms (Goguryeo, Baekje, Silla), Unified Silla, and Goryeo—whose name evolved into the modern exonym "Korea"—followed by the Joseon dynasty, which lasted centuries until its replacement by the Korean Empire in 1897. Japan annexed the peninsula in 1910, ruling until 1945, a period marked by industrialization, economic exploitation, and suppression of Korean culture and independence movements, including the 1919 March First Movement. Today, South Korea is a developed regional power with a strong economy and globally influential pop culture (K-pop, cinema), while North Korea follows a "military first" policy, possesses nuclear weapons, and is noted for having the world’s highest number of military personnel per capita and a widely condemned human rights record.

Reader's Guide

The Korean Peninsula’s significance is rooted in a deep and complex history spanning millennia, from the legendary founding of Gojoseon to the modern division that defines its geopolitical reality. Known human habitation dates to 40,000 BC, and the peninsula saw the rise of successive kingdoms and dynasties, including the Three Kingdoms period (Goguryeo, Baekje, and Silla), the unification under Silla, and the later Goryeo dynasty—whose name gave rise to the modern exonym "Korea." The Joseon dynasty, established in 1392, brought two centuries of peace, the creation of the Hangul alphabet, and the entrenchment of Confucianism, followed by another long period of isolation and cultural development after Japanese and Qing invasions. In the late 19th and early 20th centuries, Japan forced Korea open, defeated China and Russia, and eventually annexed the peninsula in 1910. Japanese rule was marked by industrialization, economic exploitation, and suppression of Korean culture and independence movements, including the March First Movement of 1919. After Japan’s 1945 surrender, the peninsula was divided at the 38th parallel into Soviet and American occupation zones, intended as temporary. In 1948, two separate states were established: the Republic of Korea (South) and the Democratic People’s Republic of Korea (North). The Korean War (1950–1953) ended in stalemate without a peace treaty, leaving a demilitarized zone that approximates the original partition. Today, South Korea is a developed regional power with a strong economy and globally influential pop culture (the Korean Wave), while North Korea follows a "military first" policy, possesses nuclear weapons, and is widely regarded as having the world’s worst human rights record. The peninsula remains a focal point of international tension and a symbol of Cold War division.

Did You Know?

• The name 'Korea' derives from the ancient kingdom of Goryeo, which ruled most of the peninsula during the 12th century.
• South Korea's economy is ranked as the world's fourteenth-largest by GDP (PPP), and its armed forces include the world's second-largest standing army by military and paramilitary personnel.
• North Korea has the highest number of military personnel of any country, with approximately 30% of its population in active, reserve, or paramilitary roles.