Byōbugaura spans approximately , with precipitous cliffs that reach an altitude of . Three strata are clearly visible on the cliffs of the inlet: the reddish Kantō Loam Stratum at the top, the Katori Statum in the middle, the chalky-white Iioka Stratum prominently on the cliff face, and the Naarai Stratum at the base. The Kantō Loam Stratum is red and is composed of material from volcanic eruptions of Mount Fuji and Mount Hakone, and the white portions of the cliff face consist of easily eroded clay.