The Kaiu Kabe is the single greatest piece of construction that has ever existed. A massive fortification, standing 100 feet tall and with foundations sunk nearly as deep, it runs from Earthquake Fish Bay in the east across nearly the entire southern border of the Empire. There are twelve towers spaced along the Wall, each of them a massive fortress unto itself. The Kaiu work on it constantly, adding improvements, rebuilding damaged sections, and installing new siege engines. There are only a handful of gates in the Wall (all located in the towers), but a set of tunnels underneath allow Crab scouts, raiding parties, and even entire armies to pass into the Shadowlands as needed. Unfortunately, the tunnels can also be used by Shadowlands creatures to get in to the Empire, so the Kaiu are constantly adding new traps and modifications to the tunnel networks.
