Which body holds the largest reservoir of water on Earth?

Oceans hold the largest reservoir of water on Earth, containing approximately 97% of all the planet's water supply. This vast expanse covers about 71% of the Earth's surface and plays a crucial role in regulating the planet's climate, supporting marine life, and influencing weather patterns. The immense volume of the oceans makes them the most significant component of the Earth's hydrosphere.

Rivers and lakes, while important freshwater resources, represent only a small fraction of the Earth's total water. Rivers account for a very minor portion, primarily acting as conduits for water movement rather than reservoirs. Lakes contain more freshwater than rivers but still fall short of the volume found in oceans. Glaciers, although substantial in their contributions to freshwater stores, primarily store water in solid form and represent a smaller percentage compared to the vast amount found in oceans. Thus, oceans indisputably contain the largest reservoir of water on the planet.