{"document_id": 138090, "version": 2, "locales": [{"version": 8, "lang": "fr", "title": "Depuis Roche", "description": "##Mont\u00e9e:\r\nDepuis le centre de Roche, aller en direction des carri\u00e8res. Un bon sentier (direction l'Hongrin) monte efficacement, en contournant la carri\u00e8re par le NW. Au lieu-dit \"Cr\u00eat de Pra Derrey\", on d\u00e9bouche dans une agr\u00e9able vall\u00e9e. Suivre le chemin en longeant l'Eau Froide sur 5 km, jusqu'\u00e0 \"Grand Ayerne\". Le long du chemin, plusieurs panneaux p\u00e9dagogiques illustrent l'ancienne exploitation du bois, en utilisant l'Eau Froide afin de l'acheminer jusque dans la vall\u00e9e du Rh\u00f4ne. Depuis Grand Ayerne, l'objectif du jour est bien en vue.\r\n\r\nDepuis Grand Ayerne, prendre la route direction S jusqu'\u00e0 Grands Esserts, puis monter SE en direction du Lac Pourri. Contourner le lac par le N. Attention, la zone est mar\u00e9cageuse... Prendre la sente montant en direction de la face N des tours. \u00c0 partir de l'alpage du Lioson, la sente se perd par endroits. Monter SW pour d\u00e9boucher sur l'\u00e9paulement \u00e0 l'W de la tour d'Ai (point cot\u00e9 2205 m sur CN).\r\n\r\nDepuis l\u00e0, deux options pour atteindre le sommet:   \r\n* Prendre la via ferrata, dont le d\u00e9but se situe juste \u00e0 c\u00f4t\u00e9 du point 2205 m. Ceci constitue la solution la plus directe, pour autant que l'on ait l'\u00e9quipement adapt\u00e9 ;\r\n* Redescendre la combe de la Chaux d'Ai sur le versant S, puis rejoindre le chemin normal de la Tour d'Ai depuis le lac d'Ai. Ceci rajoute 300 m\u00e8tres de d\u00e9nivellation \u00e0 la course.\r\n\r\n##Descente:\r\nPar le chemin normal de la Tour d'Ai jusqu'au lac d'Ai. Depuis l\u00e0, remonter la combe de la Chaux d'Ai, puis reprendre l'itin\u00e9raire de mont\u00e9e jusqu'\u00e0 Roche.", "summary": null, "remarks": "Monter \u00e0 la Tour d'Ai depuis la vall\u00e9e du Rh\u00f4ne est int\u00e9ressant par plusieurs points:   \r\n* D\u00e9nivel\u00e9 important (et efficace dans le premier et dernier tiers), constituant un excellent entra\u00eenement ;\r\n* L'itin\u00e9raire est tr\u00e8s sauvage par endroits, \u00e0 l'oppos\u00e9 de toutes les remont\u00e9es m\u00e9caniques de Leysin et de la masse de touristes ;", "gear": null, "external_resources": null, "route_history": null, "title_prefix": "Tour d'A\u00ef", "topic_id": null}], "geometry": {"version": 2, "geom": "{\"type\": \"Point\", \"coordinates\": [775433.2608097077, 5839318.63092413]}", "geom_detail": null}, "quality": "medium", "main_waypoint_id": 42847, "activities": ["hiking"], "elevation_min": 390, "elevation_max": 2205, "height_diff_up": 2200, "height_diff_down": 2200, "route_length": 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