Indonesia–Malaysia border, International land and maritime boundary in Southeast Asia.
This boundary stretches for 2,000 kilometers through dense rainforest and open water, dividing Borneo between Indonesian Kalimantan and the Malaysian states of Sabah and Sarawak. The line follows watersheds and river courses for much of its length, while maritime sections cover four separate sea zones between Sumatra and Peninsular Malaysia.
Britain and the Netherlands established this boundary in 1891 to separate their respective colonial territories on Borneo. After independence, Malaysia and Indonesia confirmed the alignment through bilateral agreements during the 1960s and 1970s.
At official crossings, traders exchange fruit, textiles and household goods while families on both sides regularly visit relatives. The shared Malay language and Muslim majority make daily life easier for people living along the border region.
Three land crossings in West Kalimantan provide regular border controls for travelers moving between Malaysia and Indonesia. Ferry connections between Sumatra and Peninsular Malaysia operate mainly in the Strait of Malacca and take several hours for the crossing.
Along the Borneo line, simple numbered concrete posts mark the boundary through rainforest areas where few people live. Some of these markers stand deep in the forest and are mainly seen by border patrols and occasional hikers.
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