Indonesian Journey: World's Most Polluted River

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We are in Indonesia's fourth largest city, Bandung, for the final instalment of our Indonesia special. We will hear about life on the world’s dirtiest river, Citarum, and the efforts to clean it up. Bandung may have its problems, but it's also a city of innovators - we hear how a new generation of street vendors is embracing a digital future. Also on the programme, how social media is shaping - and tainting - perceptions of Islam in the world’s most populous Muslim country. And we take a look at the thriving start up scene here in Bandung - we visit the company that wants to replace marble with mushrooms. Plus the dulcet tones of Mario Ginanjar, the lead singer of one of Indonesia’s biggest bands, Kahitna. Presenter Jon Bithrey is joined by Quinton Temby - Visiting Fellow at the College of Asia and the Pacific at the Australian National University and Anindrya Nastiti from Bandung Institute of Technology. PHOTO: Polluted Citarum river near Bandung, credit Ed Wray/Getty Images