The Underwater city of Calaloch {Cal-la-lock, meaning a good place to land} is located off the Menagerie Coast. It is a small city with a population of about 3,220. It was first founded by the Adria people to defend a rift between the planar dimensions. The community and city continues to protect the rift.
The Adria people are a community of unique merfolk who are descendants of both water genasi and mermaids and have the ability to not only breathe water and air, like other merfolk, but also transform between their Mer and Genasi forms to survive on both. However, being away from water for more that a few days can cause Adria to experience high levels of fatigue and even prolonged time out of water can mean they loose the ability to turn back into the Mer form.
Although not many above the water know of Calaloch, it is well know to merfolk from other communities across Taldorei. In Calaloch, its common for people to leave home and spend time on land, especially to attend specialty schools or learn trades, but most return home to keep their community thriving and serve their ancestral duty of protecting the Rift.
The rift is primarily protected by Horizon Walkers (Della’s mom is one). Generations ago the Ashari came across the Rift, as they search out and quard portals to elemental planes and sometimes other planes. The Ashari, in seeing that the portal was already being guarded by the Adria people, formed an alliance and come check in regularly.