Arroyo
/əˈrɔɪəʊ/
Definition 1 of 1
Pro Tip 1/3Geographic Usage
The word 'arroyo' is primarily used in regions where Spanish influence is present, like the US Southwest. 
When visiting Arizona, you might encounter several marked arroyos.
Pro Tip 2/3Climatic Relevance
'Arroyo' implies a climate where heavy rains are occasional, not a region with constant water flow. 
In the desert, arroyos can suddenly fill with water during rare storms.
Pro Tip 3/3Hazard Awareness
Arroyos can become dangerous during rainy periods due to flash flooding, a detail to be aware of when using the term. 
Avoid camping near an arroyo; flash floods can occur without warning.