This paper aims to examine the citizens’ initiative (CI) save Karang Mumus River in Samarinda, Indonesia, through a collective movement, namely GMSS SKM (Gerakan Memungut Sehelai Sampah Sungai Mumus). The river has complicated problems that are mostly caused by human behavior, such as pollution and illegal dwelling. Drawing on CLEAR (Can do, Like to, Enabled Ask Responded to) framework, this re...