Barrow Navigation
 

Some adventures never get out. But here is the optimal way, entering each barrow exactly once.
Note that the tomb leads to #6 if you entered it from #4 and vice versa.

downs - 7 - 10 - 3 - 4 - tomb - 6 - 1 - 11 - 2 - 13 - 8 - 15 - 14 - 12 - 5 - 9 - downs

 
Complete overview of barrow navigation
 
Barrow Upper left Lower left Upper right Lower right Notes
1116515 secret doors in left and right rooms
21113145 secret doors north lead to Lantern
3128104-
4tomb15123 button on pillar opens it (second room)
521912-
613tomb111 secret room S of main room
7910downsdowns button opens the way, key east room
81431513 secret doors in rooms 2/3, 2nd corridor
957downsdowns secret doors E in both rooms lead to key
1073downsdowns 2 barrow keys behind secret doors
1121316-
1214453 click one closed door to open the other
1311286 secret door SE in west room
14815212-
1581441elevator
tomb4 or 64 or 64 or 64 or 6 meditation spot, Zokarr's resting place