| Donghae | |
| Native Name: | Korean: 동해시 |
| Settlement Type: | Municipal city |
| Translit Lang1: | Korean |
| Translit Lang1 Type1: | Hangul |
| Translit Lang1 Info1: | Korean: 동해시 |
| Translit Lang1 Type2: | Hanja |
| Translit Lang1 Info2: | Korean: {{linktext|東|海|市 |
| Translit Lang1 Info3: | Donghae-si |
| Translit Lang1 Info4: | Tonghae-si |
| Subdivision Type: | Country |
| Subdivision Name: | South Korea |
| Subdivision Type1: | Region |
| Subdivision Name1: | Gwandong |
| Population Blank1 Title: | Dialect |
| Population Blank1: | Gangwon |
| Established Title: | First official recorded |
| Established Date: | 102 AD |
| Established Title2: | City established |
| Established Date2: | April 1, 1980 |
| Area Total Km2: | 180.01 |
| Population As Of: | October, 2022 |
| Population Total: | 89,421 |
| Population Density Km2: | 521.61 |
| Leader Title: | mayor |
| Leader Name: | Kyu eon Sim (심규언) |
| Parts Type: | Administrative divisions |
| Parts: | 10 dong |
| Blank Name: | Climate |
| Blank Info: | Cfa |
| Area Code: | +82-33 |
Donghae (; pronounced as /ko/) is a city in Gangwon Province, South Korea. There are two major ports: Donghae Harbor and Mukho Harbor. The city is located on the Yeongdong Line railroad and the Donghae Expressway. Numerous caverns are found in the city, as in neighboring Samcheok. Hanzhong University was located here.
Donghae is located in the central region of the east coast of Korea in Gangwon-do. Jeongseon county to the west and Gangneung city to the north. It contains the southern terminus of the Donghae Expressway, and the No. 7 national way passes through the city.
The city is mostly mountainous and has natural resources such as Mureung Valley and beautiful beaches. Here, the high Taebaek Mountains lie along the eastern coast, preventing rivers from meeting the coast.[1] However, in the rainy season, spontaneous water flow is possible.
Donghae area and its neighborhood are a free industry zone. From this, Gangwon province and Donghae city has overtaken team for investment.[2]
A cruise ferry line connecting Russia, South Korea and Japan opened in the summer of 2008. DBS Ferry currently transits between Donghae, Sakaiminato, Tottori and Vladivostok.[3] [4]
Donghae City has the following sister cities:[5] [6]