(CNN) -- More than seven weeks after flooding first displaced millions of people in Pakistan, the crisis is not over. Whole towns are still submerged; tent cities now dot the high ground and line the roads that are left; and more rains have prevented some relief. Flood waters are moving south, so different parts of the country are beginning to experience the effects of the flood.
The United Nations and private charitable organizations are sounding the alarm as large chunks of the country remain submerged and about 20 million people are in need of assistance.
The global spotlight may have shifted away, but floodwaters are still raging through the heart of Pakistan, creating new crises every day, said Valerie Amos, U.N. under-secretary-general for humanitarian affairs. "An immense tragedy continues to unfold," Amos said. "The human implications of what will happen if not enough is done are terrible. Many millions have already lost everything and have nothing to go back to. ... What I will be doing is asking our supporters to dig deeper and to do more."
The death toll is believed to surpass 1,700. In the extreme heat and humidity, refugees wait for medical attention at impromptu clinics. Water-borne illnesses have affected at least a million people thanks to stagnant, contaminated waters. More than 180,000 suspected cases of malaria have been reported. How you can help: Impact Your World
BackStory: The story behind the photos from CNN's Fred Pleitgen and Jonathan Wald 
Helicopter tour: Flood-ravaged Pakistan
Hungry and homeless in Pakistan
