Several Asean members, notably the Philippines and Vietnam, have overlapping claims to the sea with China and Taiwan.
China claims ownership of much of the South China Sea, along with four ASEAN states, including the Philippines.
Host President Hun Sen focused on economic issues in his opening remarks Tuesday.
Burmese President Thein Sein told reporters in Phnom Penh Tuesday the elections had been a success.
Cambodia had left the contentious issue off the agenda, following a visit by Chinese President Hu Jiantao over the weekend.
The displaced at Phnom Bath say they are vulnerable to heavy winds and rainstorms, and they fear poisonous snakes and insects.
Burma’s political reform process has been a high-profile objective for the 10 member bloc of the Association of Southeast Asian Nations.
Hu’s visit, the first from a Chinese head of state in 12 years, comes as Phnom Penh is hosting five days of Asean meetings.
Taken together, the meetings will be an indication of Cambodia’s Asean priorities.
The March 30, 1997, attack on an opposition rally killed 16 people and wounded hundreds more.
Chan Cheng is accused of helping Meas Peng flee detention after Meas Peng was accused of incitement during land protests in Kandal.