Sister cities

Twinned with Ulsan

3 of 9 in this atlas

Ulsan maintains twinning relationships with three cities across three continents: Changchun in China, Chennai in India, and Montevideo in Uruguay. Each pairing is mutual, with both sides formally naming the other in return. The spread reflects connections across East Asia, South Asia, and South America, though the dataset gives no further detail on how these ties came about.