Mangkang Kulon Subdistrict is one of the coastal area in Semarang which has relatively dynamic conditions. This could be seen from the coastline and mangrove ecosystem changes within several periods of time. This study aims to observe coastline changes and the spatial distribution of mangrove ecosystems on the coast of Mangkang Kulon Subdistrict between 2005, 2012 and 2019. Land use maps were obtained from visual interpretation of high-resolution digital globe satellite images from 2005, 2012 and 2019 which then tested the accuracy of land use interpretation through field observation. Then, it was overlayed one another through vector analysis to find out the changes that have occurred. Based on the results of the study, it could be seen that the coastline changes were increasingly jutting towards the land in these ranges of time. This condition is affected by the port construction on the east coast of Kendal Regency which is directly adjacent to the Mangkang Kulon Subdistrict. Meanwhile, the mangrove ecosystem has increased widely with relatively elongated and grouped spatial patterns. The increase that occurred as a manifestation of various coastal care activities in the form of mangrove planting activities which carried out by several government agencies and private parties with a model of coastal communities empowerment.

coastline, mangrove ecosystem, coastal area, community empowerment, Mangkang Kulon Subdistrict.