Which source is an important surface water source mentioned in the material?

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Surface water comes from bodies on the Earth’s surface, such as lakes and rivers. These are classic, widely used sources for drinking water because they provide large, accessible volumes that can be treated to remove contaminants. Groundwater is underground, so it isn’t surface water. Desalination is a treatment method for seawater, not a surface water source. Rainwater collection can supply water, but in typical material it isn’t described as the main surface water source. Therefore, lakes and rivers are the important surface water source mentioned.