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Indonesia allows more waste to enter the ocean than any other country apart from China.
620,000 tonnes of plastic are dumped into the country's rivers, which then take the rubbish out to sea.
The government plans to reduce this figure by two thirds in the next 5 years.
The Indonesian Maritime Affairs Ministry is working with CLS, which is a subsidiary of the French space agency.
Satellite beacons are being released at the mouths of rivers around Indonesia.
These trackers float like trash to identify where it goes.
Every hour, they ping data to a satellite.
The satellite transmits this information to a centre in France.
Jean-Baptiste Voisin is the head of CLS in Indonesia.
The research shows that much of the waste lands back on the country's coastline.
Happily, this makes it easier for the government to put waste collection traps at key locations.
However, there is still 10 per cent of the rubbish which won't be so easy to collect.
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