Based on the context and the answer, generate a question. 

Context: Finally we came outside the forest into an open area . Everyone was relieved to be in the open again and expecting that the end was near ... We continued along a jeep track which approached a main road . We came across a calm , serene lake with water flowing over a dam . Peter and Ramki just jumped into the water ... It must ' ve been freezing cold .

Answer:

Because the weather was cold .



What may be the reason for the water being so cold ?