A river in Depok City in Indonesia's West Java was filmed overflowing with huge clouds of mysterious foam on Tuesday 28 November.

The origin of the overwhelming foam is being investigated by the Depok City Government, though pollution is suspected -- a recurring problem in Indonesia, where filthy urban waterways are common.

The foam was found in Kali Baru in the Cimanggis area of the city.

Despite the head-high foam, some locals were seen casually fishing in the river, while others were spotted playing chess nearby.

Some locals were even seen throwing waste into the river, doing nothing to improve the situation.

The Depok City Environmental and Sanitation Agency (DLHK) says it is taking action.

The river in Depok City, West Java, Indonesia is contaminated with mysterious foam. The quantity of foam is exceptionally high, covering the river's body entirely. The origin of this foam waste is being investigated by the Depok City Government.

The environmental pollution is located in Kali Baru, Cimanggis, Depok City, West Java. The foam is thick, completely covering the river. Some residents are seen casually fishing in the foamy river area.

The foam reaches the height of an adult's body. Residents are observed playing chess nearby, and there are also those intentionally disposing of waste into the foam-covered river.

This situation is clearly unhealthy, and measures to address environmental pollution are necessary. The Depok City Environmental and Sanitation Agency (DLHK) is taking action.