Bandar Seri Begawan
Competing claims to the South China Sea have for decades been a source of tension in the region.
China's increasing assertiveness in staking its claim in recent years has caused concern for neighbouring countries, particularly the Philippines and Vietnam.
The South China Sea issue will be a top priority for Association of Southeast Asian (ASEAN) leaders during their two-day summit in Brunei beginning on Wednesday. Below are key facts on the sea and the competing claims:
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