In addition, materials used in the construction of the palaces and temples of Heijo-kyo (the ancient capital of Japan in current Nara) were brought by boat from the upper reaches of the Kizu-gawa River, making Kasagi an important place of land and water transportation.
また、平城京の宮殿や寺院などの建築用材は木津川の上流から舟で運ばれたとされており、笠置は水陸交通の要地であった。