A generation ago the three tribes of ponies joined together in harmony after the discovery of the new land of Equestria. But even years later this land is still largely unknown. The leaders of the ponies decide that an expedition to travel and learn about their new home is needed.

Locations for settlements, appropriate farmlands, rivers, forests, all need to be discovered. Roads must be planned. Borders drawn. A map made. And Trail Blazer is the pony for the job.

She may be a drunk, a floozy, and lazy, but she’s the best at what she does.

Joined by the fastidious unicorn Lustrous and the martial-minded pegasus Steel Wing the three of them will embark on the greatest undertaking of their lives: To be the first ponies to travel the entirety of Equestria and draw a grand map of it to aid and unite all ponies of present and future.