Environmental Factors Supporting Mangrove Ecosystem in Semarang-Demak Coastal Area Andin Irsadi, Sutrisno Angggoro and Tri Retnaningsih Soeprobowati E3S Web Conf., 125 (2019) 01021 Published online: 28 October 2019 DOI: 10.1051/e3sconf/201912501021