We have no way of knowing how much water is in any particular volume of space.
But 2.1 cubic meters = 2,100 liters .
There are 3,902,000 liters of water in 3,902 cubic meters.
liters
volume in units of gallons, liters, cubic feet, cubic meters etc
Liters.
you can measure it in liters or gallons
liters
2 ml
In liters
Multiply by 1000= 185000 liters
1000litres
42,000
The official UK measurement for measuring water depth is in meters.