Manitoba is known for having a significant amount of freshwater, with many lakes and rivers throughout the province. The exact amount of freshwater in Manitoba is difficult to determine, as it is constantly changing due to factors such as precipitation, evaporation, and usage.

However, some estimates suggest that Manitoba has around 101,593 cubic kilometers of freshwater resources, which includes both surface water (such as lakes and rivers) and groundwater. This accounts for approximately 15% of Canada's total freshwater resources.

Manitoba is also home to several large lakes, including Lake Winnipeg, which is one of the largest freshwater lakes in the world. The province's freshwater resources are important for a variety of uses, including drinking water, irrigation, hydroelectric power generation, and recreation.