What was the dirtiest country you ever visited?

What do you think this is a photo of?

Looks like houses in a slum, right? And it should be the dumping ground.

Believe it or not, it is a river.

If you look closely, you can see that the garbage is floating on the water. It is the Pasig River in the Philippines. Pasig, the largest lake in the Philippines, flows approximately 25 kilometers (16 mi) from Manila Bay to Lagun de Bay. The problem is that it crosses the most populous city on the planet, Manila, and as a result, it has become a local dumping ground. After World War II, when the city's population exploded, the river was used to dump factory waste, household waste, sewage and just about anything you can think of. In the 1990s, Pasig was considered biologically dead, meaning it could no longer support any aquatic life due to low levels of oxygen.

But the story does not end here.

The image on the right is the Pasig River today. Since 2008, the Asian Development Bank and the Filipino government took an initiative to rehabilitate the river. The program required bringing together the people of the city, various government agencies and environmental experts.

Filipinos themselves had run out in numbers, not even expecting to see AfDB and slowly, the Dead River began to return to life. Last year, the river won the Asian River Award for its "beauty" and "utility".

Pasig River won the first prize Asia Riverprise.