ALG-173, Portico Arch, smaller opening, Tin Tazarift West Area. 2.5 meters height (estimated). Adjacent to ALG-172. From ALG-172/173, if you proceed 200 meters northwest along the reef side and staying inside the reef, you will reach the majestic triple openings of Imestar Arch (ALG-13). See entry for that arch for the different access from In-Itinen area. From Imestar Arch you can walk northwest inside the reef for 100 meters to the "square" (or "tennis court"), and then another 100 meters to an expansive view of "The Passage" and "Unnamed Reef One."

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