What are the trees covering?
The trees are covering the hills.
    src        edge_attr  dst
0     0  to the right of   17
1     0  to the right of   24
2     0   to the left of   13
3     0  to the right of    7
4     0  to the right of   16
..  ...              ...  ...
72   23  to the right of   20
73   24               on   16
74   24   to the left of    0
75   24  to the right of   17
76   24  to the right of    7

[77 rows x 3 columns]