From Wikipedia:
Vallis Alpes (
Latin for "Alpine Valley")
[1] is a
lunar valley feature that bisects the
Montes Alpes range. It extends 166 km from the
Mare Imbrium basin, trending east-northeast to the edge of the
Mare Frigoris. The valley is narrow at both ends and widens to a maximum width of about 10 km along the middle stretch.
The valley floor is a flat,
lava-flooded surface that is bisected by a slender, broken, cleft-like
rille. The center rille is a challenging target for
telescope observation from the
Earth and described as, "notoriously hard to spot."
[2] The rille itself is longer than the valley proper, at 196.65 km ± 10.98 km, and has a width of 0.58 km ± 0.09 km and depth of 77.69 m ± 28.07 m.
I had a very hard time capturing this lunar vista, seeing was terrible. The aforementioned "notoriously hard to spot" rille is still observable even so.
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