How do you place water evenly?

[high condor]

I'm trying to fill this mountain range with water in the middle, but I can't figure out how to get it to all place all levelled like normal water.

[mint fossil]

you can make a flat selection, mask the air and then fill with water

i think there is also a waterlog operation but idk how that works

[high condor]

Making a flat selection would be a nightmare in this situation due to the shape of the bottom

And then I’d have to figure out how to make it look natural again

[fiery quail]

maybe use tool mask
Write: block = air & Y < [Insert height limit]
And use a free paint or something to draw in the water (idk if painting water works but if it does)

if painting water doesn't, paint it with a temporary block and replace it w/ water

[high condor]

Hmm I’ll have to try that

tomorrow that is