What type of river is the oued or wadi found in the valleys of North Africa and Arabia?

Exotic River
Perennial river
Episodic River
Periodic River
Wadi (or oued) is the Arabic term traditionally referring to a valley. In some instances, it may refer to a dry (ephemeral) riverbed that contains water only during times of heavy rain, a so-called episodic river. Periodic / Non-Perennial Rivers only flow during the rainy season. Exotic Rivers rise in humid areas with high rainfall and flow through dry areas.
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Very interesting!
reach: rather globaldesertsgeographygeologyriversvalleies

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Exotic River
Perennial river
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Periodic River
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flagItaly
2%
5%
83%
5%
36
flagGreece
0%
5%
83%
11%
18
flagAustria
6%
0%
68%
25%
16
flagPoland
5%
8%
61%
24%
2173
flagthe United Kingdom
7%
13%
56%
21%
65
flagSwitzerland
16%
8%
41%
33%
12
flagAustralia
0%
0%
41%
58%
12
flagGermany
6%
5%
39%
42%
92
flagthe United States
7%
26%
32%
28%
140
flagIndia
8%
35%
26%
26%
57