Which place is it?
It is a river.
     src        edge_attr  dst
0      0   to the left of    4
1      0   to the left of   10
2      0   to the left of    9
3      1   to the left of   14
4      1   to the left of   10
..   ...              ...  ...
98    20  to the right of   13
99    20   to the left of   14
100   20   to the left of    2
101   20   to the left of    6
102   20   to the left of    7

[103 rows x 3 columns]