The World

The Age of Harmony world doesn't have an 'official' map yet - I'd like to create one at some point, probably in collaboration with someone who has actual artistic talent, but it's not a high priority quite yet. Until then, the de facto map of the world is "Equestria and Beyond" by Henrik Lissner. As such, there are a few anomalies that should be addressed.

Ley Lines
Firstly, the red-and-white striped areas surrounding the world are known as 'Ley Lines' - in short, they are vast walls of some kind of magical energy. They extend downwards into the earth and upwards into the sky as far as anyone has thus far been able to reach. A person can stand almost touching a Ley Line and be unharmed - a common practice in some areas, as useful magically-charged crystals can be found abundantly near them - but care must be taken as the walls are not actually solid, and touching them is extremely dangerous.

A creature touching a Ley Line immediately starts taking damage as the chaotic currents of arcane energy tear at their bodies - complete immersion in the Ley Line is even worse, being fatal in a matter of rounds. Creatures who manage to escape back out of the Ley line before perishing are debilitatingly ill for weeks, or even months afterwards as the wounds only heal very gradually. Thankfully for them, if they survive this long then there are no further adverse effects.

Oceans and Airships
As a side-effect of the Ley Lines' existence, the oceans are rather dangerous places. Acting like conductors for magical energy, the oceans are riddled with unnaturally strong currents that can tear a sturdy ship in half. Only the Cervidans have been able to safely navigate the seas, and then only in very small boats. Coastal waters are relatively safe - as a general rule of thumb the deeper the water is, the less safe it is.

Consequently, Airships are very common in the world, being used for large-scale trade routes or passenger transport. They come in all shapes and sizes, but the vast majority of them - the 'civilian' airships - are the familiar wooden ship-like hulls hanging under large, buoyant balloons, and are pushed through the air by magically-augmented steam generators powering propellers.