Inlet, western Pacific Ocean.
Located off the east-central coast of Honshu , Japan, it is about 30 mi (48 km) long and 23 mi (37 km) wide. It provides a spacious harbour area for several Japanese cities, including Tokyo , Yokohama , and Kawasaki . A highway connecting Kawasaki with Kisarazu (pop., 2000 prelim.: 122,766) on the opposite side of the bay was opened in 1997; it includes a bridge and an undersea tunnel that is 5.9 mi (9.5 km) long.