Distant Land is a music track that is unlocked at Burgh de Rott.
The player is not required to enter Burgh de Rott at all to unlock this music track. It can also be unlocked at the Barrows by walking to the small gate below it and standing in the small alcove next to it. Another alternative is by walking east of the Uzer mine near the shore as shown below on the map. The music track is most likely not supposed to be unlockable in the Kharidian Desert.
This information has been compiled as part of the update history project. Some updates may not be included - see here for how to help out!