Mobile network operators need to identify their network edge to enable the optimal 5G network architecture, the location of the edge will differ between operators and even between services within a given operator. This talk will consider the thinking that goes in to identifying the network edge and review some of the key inputs to the decision-making process. Such inputs include; network latency measurements, RAN architecture and its planned evolution, service platforms and their alignment with future products and services, core network planning and Internet peering and transit locations