Map of Pakistan's flood area

This map shows the Indus River and the areas worst affected by the flooding. The floods spread to southern Sindh province after roaring down from the northwest and through the central agricultural heartland of Punjab, along a path at least 1,000 km (620 miles) long.

Pakistan's worst floods in 80 years have killed more than 1,600 people and affected up to 20 million - more than a tenth of the population. The United Nations estimates at least 8 million people need urgent assistance.

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The authorities and aid agencies are struggling to help survivors, many of whom have lost everything and say they received no warnings that raging waters were heading their way.

This map shows the Indus River and the areas worst affected by the flooding. The floods spread to southern Sindh province after roaring down from the northwest and through the central agricultural heartland of Punjab, along a path at least 1,000 km (620 miles) long.