The South Sudan Liberation Movement (SSLM) is an armed group that operates in the Upper Nile Region of South Sudan. The group's creation was announced in November 1999 by people of the Nuer ethnicity who were in both the rebel Sudan People's Liberation Army (SPLA) and the government-allied South Sudan Defense Force (SSDF) gathered in Waat. The SSLM was declared to be unaligned in the Second Sudanese Civil War, then entering its sixteenth year. The name "South Sudan Liberation Movement" was decided upon the next year, borrowing from the earlier Southern Sudan Liberation Movement, which existed in the 1980s.