We landed at Coca, a small oil boom town on the Napo River, a tributary of the Amazon, quite broad and muddy and flowing hard, 3000 miles from the Atlantic Ocean.  We and maybe 15 other tourists boarded a long skinny boat for a two hour motor trip downriver, past a few small towns and at least one gas flare (Ecuador has jumped on the oil bandwagon in a big way).

Here's a map of our route