How many lakes are natuarly occurring?

The exact number of naturally occurring lakes worldwide is difficult to determine, but estimates suggest there are over 3 million lakes larger than 0.1 hectares (about 0.25 acres). These lakes vary greatly in size, depth, and ecological characteristics. Major regions with notable concentrations of lakes include Canada, Russia, and the northern United States. Additionally, many smaller lakes and ponds contribute to this total, but comprehensive data on all of them is lacking.