In maps: Pakistan floods
Districts close to the Indus river have been hit hardest by the flooding.
Thousands of people in Khyber-Pakhtoonkhwa district are without basic supplies, and reaching survivors has been made more difficult by destruction and damage to bridges and roads. Concern is also mounting for Warsak dam near Peshawar - the third largest in the country - where floodwaters are still very high.
Before and after satellite images show the extent of flooding around Jacobabad on 31 July. Low lying areas, many downstream from the mountainous northern districts, have been badly hit.