The talks in the Indian capital, Delhi, focus on Sir Creek, a narrow marsh area between the two countries.
The 96km (59-mile) disputed area lies between India’s Gujarat state and Pakistan’s southern Sindh province.
The talks on the maritime boundary dispute come a week after inconclusive talks on the demilitarisation of the Siachen Glacier between the two sides.
The creek, which opens up to the Arabian Sea, has been a point of contention for decades.
India says the creek boundary should be in the middle of the estuary, while Pakistan says the border should lie on the south-east bank.
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