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A region is a collection of sites. Multiwrite replication between DSAs in the same region is synchronous.
Each site belongs to exactly one region.
You should define multiple regions to separate sites that have poor-quality connections. Doing this helps minimize the performance cost of replicating updates across these links. However, use just one region to cover for hosts that are connected by a fast network.
Multiwrite replication is asynchronous between regions. This means that the poor quality of the connections does not unduly slow directory performance.
Similarly, because regions are connected by slow links, CA Directory prevents load-sharing between regions unless load-sharing within a region is not possible.
DXmanager represents a region using this icon: 
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