Which place is it?
It is an ocean.
    src        edge_attr  dst
0     0   to the left of    9
1     0   to the left of    7
2     0   to the left of    6
3     3   to the left of    4
4     3   to the left of    7
5     3   to the left of    8
6     3   to the left of   10
7     4  to the right of    3
8     4   to the left of    8
9     6  to the right of    0
10    7  to the right of    3
11    7  to the right of    0
12    7   to the left of    9
13    7   to the left of    8
14    8  to the right of    4
15    8  to the right of    7
16    8  to the right of    3
17    9   to the left of   11
18    9  to the right of    7
19    9  to the right of    0
20   10  to the right of    3
21   11  to the right of    9