The value of a sea area along the boundaries of the marine area management for a local government is very important note. So that the management of the territorial sea boundary between two adjacent areas should be clear. Therefore, research on the marine boundary zone management needs to be done in order to avoid conflicts between the adjacent areas.This study aims to reinforce the boundary sea area of Yogyakarta Special Region by implementing the use of satellite imagery. The determination of the boundary sea area made after the base line and the line of claim 12 nautical miles determined. Then the withdrawal limit of marine area management is done using equal distance principle (equidistance).Abrasion and accretion resulted in a change in the boundary sea area of Yogyakarta Special Region. It can be seen from the changes in the location of the line of claim 12 nautical miles and the difference in the number of dots making up equidistant. The number of points the boundary sea area of Yogyakarta Special Region in 2004 was 15 points, while in 2014 was 12 points. So that within ten years the area of management of marine areas of Yogyakarta Special Region increased 2,889 Ha.