The Donghae Line is a railway line connecting Busanjin station to Yeongdeok in South Korea. The literal meaning of its name, the "East Sea Line," reflects its position along the nation's East coast. It merged with the Donghae Nambu Line on December 30, 2016, and will merge with the Donghae Bukbu Line.

The Donghae Nambu Line (Korean: 동해남부선) is a railway line connecting Busan to Pohang in South Korea. The line runs along South Korea's east coast. On December 30, 2016, it was merged into Donghae Line.