en Descriptive & Survey <span style="font-size:11pt"><span new="" roman="" style="font-family:" times=""><strong><span lang="id" style="font-size:10.0pt"><span cambria="" style="font-family:"><span style="color:#4f81bd">Aims:</span></span></span></strong><span lang="id" style="font-size:10.0pt"><span cambria="" style="font-family:"> Adolescents in coastal areas face heightened risks of early marriage and unintended pregnancy, attributed to limited access to reproductive health care and enduring socio-cultural norms. This study aimed to examine the impact of empowering coastal adolescents through youth Posyandu on the prevention of early marriage and unwanted pregnancy by assessing the roles of reproductive health knowledge and attitudes within integrated health post programs in coastal communities.</span></span></span></span><br> <span style="font-size:11pt"><span new="" roman="" style="font-family:" times=""><b><span lang="id" style="font-size:10.0pt"><span cambria="" style="font-family:"><span style="color:#4f81bd">Instrument & Methods:</span></span></span></b><span lang="id" style="font-size:10.0pt"><span cambria="" style="font-family:"> This quantitative cross-sectional study involved 210 teenagers selected through proportionate random sampling. Partial least squares-structural equation modeling was employed to examine direct effects, as well as mediating and moderating relationships among knowledge, attitudes, program-supporting and inhibiting factors, youth Posyandu empowerment, early marriage, and unintended pregnancy.</span></span></span></span><br> <span style="font-size:11pt"><span new="" roman="" style="font-family:" times=""><strong><span lang="id" style="font-size:10.0pt"><span cambria="" style="font-family:"><span style="color:#4f81bd">Findings:</span></span></span></strong> <span lang="id" style="font-size:10.0pt"><span cambria="" style="font-family:">Program supporters and inhibitors significantly influenced unintended pregnancy (t=2.881; p=0.004). Knowledge positively affected unintended pregnancy (t=6.644; p<0.001) and youth Posyandu empowerment (t=6.168; p<0.001). Attitudes had a positive effect on unintended pregnancy (t=6.09; p<0.001) but had no significant effect on empowerment (t=0.479; p=0.632). Empowerment significantly reduced unintended pregnancy (t=2.566; p=0.01). Empowerment partially mediated the effect of Knowledge on early marriage and unintended pregnancy (indirect effect=-0.061; p=0.035), whereas attitudes had no mediating role. Program characteristics did not moderate the impact of empowerment on unintended pregnancy (t=0.227; p=0.82). </span></span></span></span><br> <span style="font-size:11pt"><span new="" roman="" style="font-family:" times=""><strong><span lang="id" style="font-size:10.0pt"><span cambria="" style="font-family:"><span style="color:#4f81bd">Conclusion:</span></span></span></strong><span lang="id" style="font-size:10.0pt"><span cambria="" style="font-family:"> Enhancing adolescents&rsquo; understanding and empowering Youth Posyandu are critical strategies to prevent early marriage and unintended pregnancy in coastal communities.</span></span></span></span> Teenagers [https://www.ncbi.nlm.nih.gov/mesh/68000293], Prevention [https://www.ncbi.nlm.nih.gov/mesh/81000517], Marriage [https://www.ncbi.nlm.nih.gov/mesh/68008393], Unwanted Pregnancy [https://www.ncbi.nlm.nih.gov/mesh/68011275], 205 213 http://hehp.daneshafarand.org/browse.php?a_code=A-10-1-110&slc_lang=en&sid=4 R. Rahman 1003194753284600380560 1003194753284600380560 Yes Department of Public Health, Faculty of Public Health, Halu Oleo University, Kendari, Indonesia R. Majid 1003194753284600380561 1003194753284600380561 No Department of Public Health, Faculty of Public Health, Halu Oleo University, Kendari, Indonesia Y. Sabilu 1003194753284600380562 1003194753284600380562 No Department of Public Health, Faculty of Public Health, Halu Oleo University, Kendari, Indonesia S. Suhadi 1003194753284600380563 1003194753284600380563 No Department of Public Health, Faculty of Public Health, Halu Oleo University, Kendari, Indonesia L.A. Kalza 1003194753284600380564 1003194753284600380564 No Department of Public Health, Faculty of Public Health, Halu Oleo University, Kendari, Indonesia L.O. Ahmad Saktiansyah 1003194753284600380565 1003194753284600380565 No Department of Public Health, Faculty of Public Health, Halu Oleo University, Kendari, Indonesia S.T. Dewi 1003194753284600380566 1003194753284600380566 No Department of Public Health, Faculty of Public Health, Halu Oleo University, Kendari, Indonesia