Mountains are where earth and heaven were understood to touch, and the traditions built accordingly. Sinai and Zion in the Hebrew scriptures, Olympus for the Greeks, Kailash for Hindu and Buddhist Asia, the sacred peaks of Shinto and of the Andes: across cultures the mountain is the meeting place, climbed by prophets and circled by pilgrims, its summit reserved for revelation. Temple architecture repeated the shape, the ziggurat and the stupa both artificial mountains. A dream mountain stands in that lineage whether the dreamer knows it or not.
The interpretive traditions read the dream mountain by the dreamer's position on it. The ascent is effort toward something high, achievement, understanding, the overview the summit promises; the summit itself is arrival and perspective, the point from which the country of a life becomes visible; the unclimbed mountain ahead is the obstacle or the calling, depending on the dreamer's feeling before it. Descent, often neglected, is read in the mountaineering traditions' own spirit, the return with what was gained, which is where most accidents happen.
The Jungian school folded the image into its account of the work of individuation, the long climb toward wholeness, and popular dream dictionaries compress the same material into obstacle and ambition. These are the traditions' readings; the mountain's authority in dreams, older than any of them, comes from the landscape of the sacred itself.