What does the snow cover?
The snow covers the mountain.
    src        edge_attr  dst
0     0         covering    9
1     1   to the left of    5
2     3   to the left of   23
3     3   to the left of   18
4     3  to the right of   21
..  ...              ...  ...
67   25   to the left of   12
68   25               on   11
69   25   to the left of    5
70   26   to the left of    4
71   26   to the left of   12

[72 rows x 3 columns]