Zone — это specific deployment area внутри региона cloud provider. В managed training и infrastructure contexts размещение related resources в одной зоне может improve performance, reduce latency и simplify resource coordination.
A specific deployment area within a Google Cloud region. In the context of Managed Training on reserved clusters, for best performance, all components of the service (the cluster, Filestore, and Managed Lustre instances) should be created in the same zone.