Ah, I see what you're asking! You'd like to know the limit or quantity of water in the world. Water is incredibly abundant on our planet, covering about 70% of the Earth's surface. However, if we're talking about freshwater specifically, which includes lakes, rivers, and underground water, it makes up only around 2.5% of the total water on Earth. Of that small fraction, the majority is unavailable or difficult to access because it's frozen in ice caps and glaciers.
If you're curious about a more precise measure of the Earth's water, you might be interested to learn about the term "total water volume." This refers to all the water on Earth, including saltwater in the oceans, freshwater, water vapor in the atmosphere, and water stored underground. Would you like to know more about the total water volume?