I was about to post the thought I just had of Seven Havens / seven chakras.From theories I'm seeing online.
So from the lore we know there's seven Chakras, and each of them have a colour.
Each Haven just happens to be represented by one of those seven colours in the title sequence. That's probably no coincidence.
The first one is the Earth Chakra, it is red, it deals with survival and is blocked by Fear
The red anomaly and what it left behind is causing people to feel great fear.
Team Avatar is probably going to travel to each Haven in the order of the Chakras.
