evidence: Another key factor related to maritime delimitation is the maritime security issue. Maritime delimitation is often conducted in order to establish stability in a certain region by clarifying each state's maritime belonging. Meanwhile, the Malacca Strait and the Singapore Strait, where Pedra Branca, Middle Rocks, and South Ledge are located, are considered as insecure areas with high level of navigational incidences. These incidences include, but are not limited to, hijacks, robbery, violent boarding, kidnap-for-ransom, boarding, and discharge of firearms. Therefore, security patrols need to be enhanced in the region with better collaboration among neighbouring states: Indonesia, Malaysia, and Singapore. Joint patrol is one of the options for the three. However, without certainty in maritime division, since maritime delimitation has not yet been completed in the region, security enforcement may be problematic. The certainty in territory ownership and maritime jurisdiction will motivate the efforts to maintain maritime security. Therefore, maritime delimitation, being one of the essential requirements in security maintenance, should be one of the top priorities on the agenda.