The Lands of Turquoise Fire

[Tear]

A short summary what the map is about:

A medieval world.
An asteroid broke up in the atmosphere and one of the main continents was bombarded with burning shards that shattered the lands.
Some of them were burning with a turquoise flame and the survivors later found a turquoise, salt-like substance at the impact sites.
The substance is solvable in water and while being corrosive and poisonous in high concentrations, not all of those who came into contact with it died instantly. Some came into contact with just the right concentration level and developed supernatural abilities before they perished.
Of course the substance was carried away by the ocean currents and many animals died. It was carried ashore to lands that weren't hit by the shards.
Soon weird magical creatures appeared.
After the initial chaos, the surviving powers tried to gain control of the mining sites and it became a dangerous but potent and expensive trade good.
Sages started refining the turquoise substance to gain access to magical abilities.
But I digress.

The map tries to show the ocean currents that carry away coastal and underwater deposits of the substance.
It also tries to show areas with higher and lower concentration in the water.

It is currently still a work in progress and is done in Photoshop.