The three men from Nambuthulai, about 60 km from here, in Ramanathapuram District were arrested after Sri Lankan Naval personnel intercepted their boat and found the narcotic, police said quoting information received by them.
The ganja, worth lakhs of rupees, was grown in Kerala and allegedly being smuggled to Sri Lanka from here, they added.
In September last, six people, including an Indian, had been arrested by Sri Lankan Navy with over two kgs of heroin in their possession.
Sri Lankan Navy's northern Commander Rear Admiral Piyal de Silva had then said 612 kg of Kerala ganja coming to Lanka from India had been detected during the last 18 months.
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