Montes Alpes is a mountain range in the northern part 's near side. To the west of the range is the level and nearly featureless mare, while on the eastern face is a more rugged continental area with a higher albedo. The range begins about one crater diameter northwest of the crater Cassini, at the Promontorium Agassiz, then stretches about 50 kilometres to the northwest and continues in intermittent fashion to the eastern rim of the dark-floored crater Plato. (wikipedia entry)
A mons is a mountain. On the Moon they are named after terrestrial mountain ranges, nearby craters, and deceased scientists who have made outstanding or fundamental contributions to their fields.