The drugs, which were in transit from Thailand to other countries, are estimated to be worth at least US$70 billion.
Most of the illicit drugs seized were destined for overseas locations, including Australia, New Zealand, Hong Kong, Taiwan, and Singapore.
According to data from the ONCB, Australia is the primary overseas destination of drugs smuggled from Thailand.
In 2020, more than 30 kg of crystal methamphetamine (also known as ice) and 62 kg of heroin were seized by the Thai authorities before they could be shipped to Australia.
From the beginning of 2021 till November, more than 321 kg of ice and 22 kg of heroin bound for Australia were seized at Thai customs points. More than 316 kg of ice transported from Thailand were seized in Australia.
Drug smugglers concealed their products, such as in buckets of thick paint or wrapped in tea packets, before the substances reached hired couriers at their destinations.
Recently, smugglers have also pivoted from airports to shipping routes to transfer their products across the region.
The number of illegal drugs sent from Thailand to Singapore is also increasing relative to last year.