Looking at the following texts:
After this I looked, and there before me was a great multitude that no one could count, from every nation, tribe, people and language, standing before the throne and before the Lamb. They were wearing white robes and were holding palm branches in their hands.
I answered, "Sir, you know." And he said, "These are they who have come out of the great tribulation; they have washed their robes and made them white in the blood of the Lamb.
I think it is safe to conclude that the "great multitude" John saw in verse 9 are those who have come out of the great tribulation.
And I think it is safe to conclude that the event which John saw take place in "spiritual realm (heaven)"
This would means that the great multitude who are "come out of the great tribulation" whom John saw are a spirits of a dead people.
Assuming the above is correct, In looking at verse 17 :
For the Lamb at the center of the throne will be their shepherd; 'He will lead them to springs of living water.' 'And God will wipe away every tear from their eyes.'"
Now my question is Regarding the phrase
He will lead them (that great multitude) to springs of living water"
Where exactly where will this take place? Where are these springs?