Which place is it?
It is a sea.
    src        edge_attr  dst
0     0  to the right of    2
1     0   to the left of    4
2     0  to the right of    6
3     1   to the left of    5
4     1  to the right of    2
5     2   to the left of    1
6     2   to the left of    0
7     2   to the left of    4
8     3               of    1
9     4  to the right of    2
10    4  to the right of    0
11    5               at    1
12    5  to the right of    1
13    6   to the left of    0
14    6               on    1