def get_region(regions, cluster):
    """ Gets the region name from the cluster ID

    Args:
        regions (dictionary): dictionary of regions where shortname is the key to the long name value.
        cluster (str): the OCI ID of the cluster in question.

    Returns a string of the region long name.
    """
    region_short_name = cluster.split('.')[3]

    return regions[region_short_name]