The eastern coast of Vietnam looks something like the ridges on a dragon's back as it curves down along the South China Sea.

Travelling among the 3,000 islets of Vietnam's Ha Long Bay

Jon Bowermaster traced that curving path in an unusual way: by sea kayak.

Schoolchildren in Sam Son, on the coast, south of Ha Long Bay

Bowermasters' 800-mile long journey along the coast of Vietnam back in 2001 is the subject of a new book called Descending the Dragon.

Rice fields in the distance at Hue, a coastal city north of Da Nang

The answer to our Geo Quiz is Ha Long Bay, Vietnam. Listen to the interview:

A view of the Ma River Delta

Listen to more:

Jon Bowermaster reflects on how tourism is transforming Vietnam:

Jon Bowermaster talks about his Government minder Linh and what he learned from him during the 2 months they spent kayaking together:

Bowermaster contemplates where he'll go next:

A village of houseboats at Hoi An, just south of Da Nang, marks the southern end of Jon Bowermaster's 800-mile sea kayaking expedition