War Map to Tier Correlation

mdm_mi

Where can I find out the following information about the AW Map and Nodes that correlate to Tier level?

Easy = Tier ? ~ Tier ?
Normal = Tier ? ~ Tier ?
Intermediate = Tier ? ~ Tier ?
Hard = Tier ? ~ Tier ?
Challenger = Tier ? ~ Tier ?
Expert = Tier ? ~ Tier ?

Fenico

Expert 1-3
Challenger tier 4-5
Hard 6-9
Intermediate 10-12

Rest i have no idea

SummonerNR

Unless they are changing them, it has been ...