The route begins in Cambodia at Siem Reap and then winds downriver to Tonlé Sap lake, before joining the Mekong Delta and sailing into Vietnam. The final port of call is Vung Tau, in south Vietnam.

Hosts Jeremy Clarkson, Richard Hammond, and James May journey through Madagascar in search of buried treasure.

On a road trip, the trio dish up a hair-raising mountain climb, bomb defusals, propeller powered cars, helicopter stunts and the most thrilling race of their lives before reaching the English Channel for a jaw dropping medieval climax.