custom_mc_advancements/data/locations/advancements/mont_canopy.json

{
    "display": {
        "icon": {
            "item": "minecraft:snowball"
        },
        "title": "Mont Canopy",
        "description": "Hit the slopes at Mont Canopy (W 55)",
        "frame": "task",
        "show_toast": true,
        "announce_to_chat": true
    },    
    "parent": "locations:landmarks",
    "criteria": {
        "be_near": {
            "trigger": "minecraft:location",
            "conditions": {
                "dimension": "minecraft:overworld",
                "position": {
			"x": {
			    "min": -500,
                            "max": -318
			},
                        "y": {
                            "min": 130,
                            "max": 223
                        },
                        "z": {
                            "min": -120,
                            "max": 50
                        }
                }
            }
        }
    }
}