According to Estimote:
There is almost no limit to how many beacons can be included in a single region (technically, it’s over 4 billion).
How do we add more than one beacon in one single region for monitoring?
We create a region like this:
UUID ESTIMOTE_PROXIMITY_UUID = UUID.fromString("B9407F30-F5F8-4568-AFF9-25556B57FE6D");
Region ALL_ESTIMOTE_BEACONS = new Region("regionId", ESTIMOTE_PROXIMITY_UUID, null, null);