Richmond is connected by a system of bridges and tunnels to Vancouver and Delta, and through the New Westminster suburb of Queensborough (on eastern Lulu Island) to the "mainland" portion of New Westminster. Three bridges (one of them twinned) connect Lulu Island to Sea Island and the Vancouver International Airport; one bridge connects Sea Island and the Vancouver International Airport to Vancouver; two bridges connect Lulu Island to Vancouver; one bridge connects Queensborough (on eastern Lulu Island) to New Westminster; one bridge connects Queensborough to Annacis Island in Delta; one twinned bridge connects Richmond to Annacis Island; and one of the few underwater tunnels in British Columbia connects Richmond to Delta.