Hearthstone has 4 server regions worldwide.
Americas
Multiple US datacenters (California, Texas, Washington) High population Covers North America, South America, Australia and New Zealand. Players in the Americas cannot interact with European or Asian accounts — collections are region-locked. Europe
Multiple EU datacenters (Sweden, Germany, France) High population Covers Europe, Middle East, Africa, and Russia. Blizzard datacenters in Stockholm (SE), Frankfurt (DE), and Paris (FR) confirmed. Asia
Taiwan and South Korea datacenters Medium population Covers East and Southeast Asia. Australia and New Zealand were moved from Americas to Asia-Pacific for esports purposes in 2015. China
China (NetEase operated) High population Operated by NetEase, not Blizzard directly. Hearthstone in China resumed after a service interruption. Separate account system from global regions. Connection: Dedicated servers
All game sessions run on Valve-hosted or publisher-hosted servers. Your connection quality depends entirely on the routing between your ISP and the data center.
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