What place could this be?
It is a shore.
    src        edge_attr  dst
0     0   to the left of    5
1     0   to the left of    2
2     0   to the left of    4
3     0  to the right of    3
4     2  to the right of    3
5     2  to the right of    0
6     3   to the left of    2
7     3   to the left of    0
8     3   to the left of    4
9     3   to the left of    7
10    4  to the right of    3
11    4  to the right of    0
12    5  to the right of    0
13    7  to the right of    3