Imabari Castle - Though it is officially classified as a rinkakushiki, a flatland castle, but because its wide moat is fed by the nearby sea, Imabari Castle is also one of the "three great water castles". Imabari Castle was built in 1602 by Todo Takatora, widely considered to be the greatest Japanese castle builder. Of the great castles he built: Edo in Tokyo and Nijo Castle in Kyoto, - were built for others, Imabari he built for himself. One of Todo's innovations here was building wide moats for extra protection from firearms. The moat at Imabari Castle could also have the water level raised or lowered by a series of sluice gates.