Uljin (울진군, 蔚珍郡, grass.gem.county) is a county in Gyeongsangbuk-do. The population as of 2004 was 58,869, including:
- 58,590 Koreans and
- 279 non-Koreans.
- Area: 989.05㎢
- Population density: 64/㎢ (2003)
- Number of households: 24,115 (2003)
- Administrative divisions: 2 eup, 8 myeon
- Location of county office: 464 Eupnae-ri, Uljin-eup, Uljin-gun (울진군 울진읍 읍내리 464)
- County flower: 매화
- County tree: 적송
- County bird: Seagull (갈매기)
Uljin is located at 129°4'~129°29' East, and 36°38'~37°8' North, at the far east side of Gyeongsangbuk-do. To the north is the city of Samcheok in Gangwon-do, to the west is the county of Bonghwa, to the southwest is the county of Yeongyang, to the south is the county of Yeongdeok, and to the east is the sea.
On the west side of the county are a number of mountains such as Baegamsan (백암산, 1,004m), Tonggosan (통고산, 1,067m), Tonggilsan (통길산, 1,007m), and Omisan (오미산, 1071m).
Being next to the sea the weather is moderate, with an average yearly temperature of 12.8℃, an average temperature in January of －0.1℃, and an average temperature in August of 25.5℃. The moderating influence of the sea can be seen in the fact that in January, Uljin is 4℃ warmer on average than Yeongju, located a bit south of Uljin and off to the west. One reason for this is because the Taebaek Mountains block the cold northern wind. The average yearly precipitation is 964.9 mm, less than most of the country.