Co To is an island district of Quang Ninh Province in the north-east region of Vietnam. The island covers an area of 46 km². We at Golden Trekking Tours Vietnam don’t run any trekking tour in the island. If you look for Co To treks, Co To hikes, hiking Co To Vietnam, Co To trekking tours, Co To hiking tours you should move further north to Binh Lieu district, or other provinces such as Ha Giang, Cao Bang…