The world of the West Marches is a young and undeveloped. Estia is the biggest city in the known world. The 10 miles around Estia is relatively safe. There are many small villages that support Estia with food production and other. After that 10 miles the wild claims the world. Very few people have ever ventured further. And those that leave come back with tales of monsters so terrifying that most can't even imagine them.