When Java Shack owner Chris Fawbert heard new COVID travel restrictions were coming he feared it spelled the end for his 23-year-old restaurant.

The Ciliwung is a highly polluted river running from Mount Pangrango in western Java, through the city of Bogor, before ending in the bay north of Jakarta, Indonesia’s capital. Since 2018, Bogor ...

But the Citarum River, which at almost 300 kilometers (190 miles) from source to mouth is West Java’s longest river, is considered one of the world’s most polluted water courses.