This article examines fractures in the social representations of a contested peace agreement in the longstanding territorial conflict of Mindanao. We compared representational structures and discourses about the peace talks among Muslims and Christians. Study One used an open-ended survey of 420 Christians and Muslims from two Mindanao cities identified with different Islamised tribes, and employed the hierarchical evocation method to provide representational structures of the peace agreement. Study Two contrasted discourses about the Memorandum of Agreement between two Muslim liberation fronts identified with separate Islamised tribes in Mindanao. Findings show unified Christians’ social representations about the peace agreement. However, Muslims’ social representations diverge along the faultlines of the Islamised ethnic groups. Findings are examined in the light of ethnopolitical divides that emerge among apparently united nonmigrant groups, as peace agreements address territorial solutions. Research results are likewise discussed in relation to other tribally contoured social landscapes that carry hidden, yet fractured ethnic narratives embedded in a larger war storyline.