Which reservoir in the water cycle contains the most water?

The largest water reservoir is the ocean, containing 97.3% of all water on Earth.

Ocean

Explanation:

water cycle is the process in which water changes its form from water to water vapor through process evaporation and then back to water through the process of precipitation.

water which falls on earth is stored on earth. The storage is called reservoir.

It is stored in glacier, rivers, streams, lakes, ground, polar ice and oceans.

Ocean is the largest water reservoir which contains around 97.3 percent of total water on earth. Next is glacier which contains around 2 percent of all water.