In northern Jejudo, two of the harbor areas and the seashore area have been designated as Udo Maritime Park in order to protect the natural environment and promote tourism.

• 北济州郡为了保护牛岛的自然景观和清净海区，并搞活海洋观光，将岛内的两处港口的周围及牛岛附近的海域指定为牛岛海洋郡立公园。