TRIBUTARY
RIVERBED
ESTUARY
MEANDER
SOURCE
X
E
S
T
U
A
R
Y
J
L
Q
P
O
O
R
P
L
I
O
M
O
O
O
X
P
U
Y
A
Q
Z
N
U
F
K
S
W
R
R
R
O
P
Z
U
M
B
O
O
E
A
I
J
A
N
M
K
N
U
V
D
T
V
Y
U
E
R
M
X
R
Z
N
U
E
X
I
C
D
E
K
C
E
A
B
R
G
O
A
A
W
T
E
A
E
I
B
W
H
I
O
E
G
M
U
M
R
E
U
U
Z
I
U
W
M
B
X
T
D
T
I
A
Y
S
