Table 2 The distribution of Water Resources Zones in the world.

From: A data set of global river networks and corresponding water resources zones divisions

The number of WRZ

Asia

Europe

Africa

North America

South America

Australasia

Global

L1

41

16

19

15

15

13

119

L2

578

205

355

240

220

74

1672

L3

9432

1945

4765

2995

2929

805

22,871

L4

23,923

4434

11,624

9480

7534

3842

60,837