In NuoDB 2.0.1, a region is a property that represents a geographic location for the database. Such locations might include a data center in a major city, country, or building location. A single NuoDB database can have multiple distinct regions. In addition to representing a location, regions can also be used to enforce database consistency, by constraining write transactions to complete only when a specified number of regions observed the write. This transaction level constraint is call "region level commit".

Read more: Configuring a NuoDB Database for Geo-Distributed Deployment | NuoDB Developer Center