Chesapeake Bay BridgeâTunnel. Not to be confused with Chesapeake Bay Bridge. The Chesapeake Bay BridgeâTunnel (CBBT) is a 23-mile (37 km) fixed link crossing at the mouth of Chesapeake Bay in the U.S. state of Virginia. It connects Northampton County on the Delmarva Peninsula with Virginia Beach, which is part of the Hampton Roads metropolitan area.