

O rio Tejo passa por Lisboa.
Vamos nadar no rio?
A água do rio não está fria.
"o rio" is in the lesson "Countryside" (Level 16), along with 10 other useful words. LinDuo has 180 topic lessons like this one, 2,380 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.