below is a reposting of something I’ve shared in a similar thread:
I made a couple posts in the above linked thread on this exact topic. I would encourage you to have a look through it but some of the big takeaways are:
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Classic Era realms are now connected based on timezone/server type, commonly referred to as ‘clusters’
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The NA PvE East cluster realm of Mankrik receives free PvE transfers
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The NA PvP West cluster realm of Whitemane receives free PvP transfers
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All NA Classic Era clusters are in the same battlegroup, hence queues for instanced PvP Battlegrounds are the same no matter where you play
I myself play on one of the smaller PvP clusters in the East. We’re still mostly leveling but have recently broke into UBRS for the start of our ‘raiding’ progression. If you have any questions, ask away!