Củ Chi tunnels
The tunnels of Củ Chi are an immense network of connecting tunnels located in the Củ Chi District of Ho Chi Minh City ( Saigon ) , Vietnam , and are part of a much larger network of tunnels that underlie much of the country . 
<triplet> Củ Chi District <subj> Ho Chi Minh City <obj> located in the administrative territorial entity <subj> Vietnam <obj> country <triplet> Ho Chi Minh City <subj> Vietnam <obj> country <triplet> Vietnam <subj> Ho Chi Minh City <obj> contains administrative territorial entity