There is a clear distinction between edge and a region. That distinction is defined by the distance and by relation latency. Edge locations are not heavy regions or data centres, per my understanding and hence limited by compute/storage capability. They are also high in number. Cloudflare has 100 odd edge locations all around the world.

Cloudflare and Akamai both have the concept of edge workers - light weight application APIs that can serve modest capacity. Cloudflare also has a cache on the edge.

https://blog.cloudflare.com/introducing-cloudflare-workers/ https://developers.cloudflare.com/workers/learning/how-the-c...