Where is the sand?
The sand is on the shore.
    src        edge_attr  dst
0     0           behind   16
1     0  to the right of    9
2     0  to the right of   14
3     2  to the right of   11
4     2  to the right of   10
5     2               on   17
6     2  to the right of    7
7     2  to the right of    4
8     3               on   14
9     4   to the left of    2
10    6               on   15
11    7   to the left of    2
12    9   to the left of   16
13    9   to the left of    0
14   10   to the left of   17
15   10   to the left of    2
16   10               in   13
17   11   to the left of   17
18   11               in   13
19   11   to the left of    2
20   12             near   16
21   14   to the left of    0
22   14               on   13
23   14   to the left of   16
24   16  to the right of   14
25   16  to the right of    9
26   16      in front of    0
27   16               on   12
28   16             near   12
29   17  to the right of   11
30   17  to the right of   10
31   17               in   13