A Docking Site is a word used in River Terms. When A River is killed they are brought back to life three days later in there next body. When a River dies they can go anywhere in the world or even on alien planets.
When another River dies they will be born in a new body in a close area towards where the other River has died. However there can be times when fate will take a hold making a River be away from his other Rivers they are then guided back by fate to the rest of the Rivers when the time is right.