Use this tool to quickly figure out the latency between you and AWS datacenters around the world:
https://aws-latency-test.com/

I randomly found this tool when I was reading https://docs.megalithic.me/the-gentlemans-guide-to-routing-nodes/gentlemans-networking-stack | https://archive.ph/0NrxE#selection-1521.72-1523.29

It's a neat tool. Even if not bookmark-worthy, it may come in handy at some point.