UN Secretary-General Antonio Guterres on Saturday visited several areas of Pakistan ravaged by floods, calling for increased global financial support at the end of a two-day trip aimed at raising awareness of the disaster.

Record monsoon rains and glacier melt in northern mountains have triggered floods that have killed more than 1,391 people, sweeping away houses, roads, railway tracks, bridges, livestock and crops.

Pakistan estimates the damage at $30 billion, and both the government and Guterres have blamed the flooding on climate change.

"Today it's Pakistan, tomorrow it could be your country wherever you live. This is a global crisis it requires a global response," Guterres told a news conference at the end of his visit.

Huge areas of the country are still under water and hundreds of thousands of people have been forced from their homes. The government says the lives of nearly 33 million people have been disrupted.

Residents and health workers are becoming concerned about rising numbers of children suffering from gastroenteritis and other illnesses, with many forced to drink contaminated flood water.

Speaking to reporters later in the southern city of Karachi, Guterres said the international community needed to do more to help countries hit hardest by the effects of climate change, starting with Pakistan.

(With input from Reuters)