The North Atlantic Ocean Mermaids live in the North Atlantic Ocean Castle. Their princess and ruler is Rina. The Mermaid's tails are different shades of green, and most of them have green hair. They only appear in Episode 7 of Mermaid Melody Pichi Pichi Pitch and Episode 10 of Mermaid Melody Pure.
List of North Atlantic Ocean Mermaids
If The North Pacific Ocean mermaids need to talk with mermaids from other kingdoms, they use whales.