It is the portion from this second boundary up to the outer boundary, the imaginary line that connects the lighthouse landmark at Punta del Este to the lighthouse landmark at Punta Rasa.

"Results": [
    {
        "TypeName": "LOC",
        "Text": "Punta del Este",
        "Start": 130,
        "End": 144
    },
    {
        "TypeName": "LOC",
        "Text": "Punta Rasa",
        "Start": 175,
        "End": 185
    }
]