What Azure feature replicates resources across regions that are at least 300 miles away from each other? Region pairsAvailability Zones

The Azure feature that replicates resources across regions that are at least 300 miles away from each other is called "Region Pairs".

Here's a step-by-step explanation:

1. Azure has a concept of paired regions, which are strategically chosen to be at least 300 miles apart within the same geography (such as US, Europe, or Asia).

2. The idea behind this is to ensure that if one region is affected by a disaster, the other region in the pair is likely to remain unaffected.

3. When you create a resource in a region, Azure will automatically create a replica of that resource in the paired region.

4. This provides a high level of redundancy and protection for your applications and data, ensuring that they remain available even in the event of a major disaster.

5. This feature is automatic and does not require any additional configuration on your part.

Please note that "Availability Zones" are a different concept. They are unique physical locations within a region. Each zone is made up of one or more datacenters equipped with independent power, cooling, and networking. It is possible to use Availability Zones to further protect your applications and data from failures.