Mong Cai is a city of Quang Ninh Province in the north-east region of Vietnam, on the border with Dongxing city of China’s Guangxi Autonomous Region. We at Golden Trekking Tours Vietnam don’t run any trekking tour in Mong Cai. If you look for Mong Cai treks, Mong Cai hikes, hiking Mong Cai Vietnam, Mong Cai trekking tours, Mong Cai hiking tours you should better travel further north to Cao Bang, Lang Son, or Ha Giang.