Aburatsubo (油壺) is an inlet on the west side of the Miura Peninsula in Kanagawa, Japan, facing Sagami Bay on the Pacific Ocean.
During historic times, the Aburatsubo inlet was selected by the feudal Miura family to build a series of fortifications, with Arai castle at its center.
During the Sengoku period, the castle fell after a 3-year siege to the rival Later Hōjō clan, in the year 1516.
According to some stories, the name Aburatsubo ("Oil Vase"), comes from the time when hundreds of samurai, fleeing the troops of Hōjō, drowned in the waters of the inlet and left it a sea of blood.
Regardless of the reason, the adjacent Shirahige shrine, dedicated to Fukurojin, was built as thanks for the inlet's calmness.