Judas Rock (63°52′S 61°7′W) is a rock, which is awash, lying 5 nautical miles (9 km) west of the southwest end of Trinity Island, in the Palmer Archipelago, Antarctica. It was shown on an Argentine government chart of 1950. It was so named by the UK Antarctic Place-Names Committee in 1960 because the rock marks the southern extremity of a shoal area which extends northward from it for 3 nautical miles (6 km) in an otherwise clear passage.
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Judas Rock Wikipedia(Text) CC BY-SA