W 9 Lagoon with shelf to the south. 

Near the south end of the shelf is an eightpointed symbol, gate to the Fire Node.
 
T4 Nodes of Elemental Evil 1 2 3 4 5 6 7 8 9 10
T1-4 Temple of Elemental Evil 11 12 13 14 15 16 17 18 19 20
1eo 21 22 23 24 - - - - - -