What color is the river, brown or blue?
The river is brown.
    src        edge_attr  dst
0     0  to the right of    2
1     0   on the side of   15
2     2  to the right of   13
3     2   to the left of    0
4     6  to the right of   14
5     6  to the right of   17
6     7               on   12
7     8  to the right of   11
8    10      floating on   15
9    10               in   15
10   10  to the right of   11
11   11   to the left of    8
12   11   to the left of   10
13   13   to the left of    2
14   14   on the side of    8
15   14   to the left of    6
16   17   to the left of    6