Felsenthal (FEL-sen-thahl), village (1990 pop. 95), Union co., S Ark., 31 mi/50 km ESE of El Dorado, at W end of Felsenthal Lock and Dam (Ouachita R.); impounds L. Jack Lee to N; 33°03'N 92°09'W. Felsenthal Natl. Wildlife Refuge to N; Lower Ouachita Wildlife Management Area to SE.