We set sail for for today's Geo Quiz.

USNS ImpeccableUS and Chinese officials are trading verbal volleys over a maritime incident in the South China Sea. Two days ago, a US Navy mapping ship was confronted there by Chinese vessels. The Pentagon accuses the Chinese ships of surrounding and harassing the USNS Impeccable in international waters.

China said today the Impeccable violated international law in the South China Sea and that it was operating there without China's permission.

International disagreements are not new to the South China Sea.

There are territorial disputes over many of the 200 or so small islands and reefs there.

We won't try to settle that score - we just want you to name SIX countries that are are currently engaged in territorial disputes involving the South China Sea.

Here's a hint --- all six border the sea...