Which place is it?
It is a lake.
    src        edge_attr  dst
0     0   to the left of    3
1     0   to the left of    2
2     1  to the right of    6
3     2  to the right of    6
4     2               in    7
5     2  to the right of    0
6     3               in    7
7     3  to the right of    0
8     3  to the right of    6
9     6   to the left of    2
10    6   to the left of    1
11    6   to the left of    3