River Trent.
Groot River in south Africa
Tagus
There doesn't seem to be one. It seems to be discussing a body of water, but nothing seems to fit. Brook (5 letters) Creek (5 letters) River (5 letters) Stream (6 letters) "A stream" is 7 letters, but that is 2 words and has a space.
A striped animal that has a name that is 5 letters long is the zebra. Another striped animal with a name that has 5 letters is the tiger.
The Huge star name with 3 and 5 letters is the Red Giant.
tulip
There are total of 5 letters in Mario
Cobra
The South American nation of Chile has a name with 5 letters.
hedge
Paper
Chile.