Clean, green Singapore? These photographs of Singapore's dirtiest places may make you think twice.

An anti-littering volunteer group, the Waterways Watch Society, recently organised what to many might have sounded like an odd contest for a country with a worldwide reputation for being spotless. It asked Singaporeans to send in photographs of some of the dirtiest places here between February and April this year. It picked 10 winners in May from about 60 submissions.

The dozens of photographs sent in showed void decks, parks and roadsides from Toa Payoh to the Central Business District strewn with rubbish.