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As far as I have been able to locate and from my experience there is not an West Altepa (S), perhaps you mean Abyssea - Altepa.

The maw is located at J-10 in South Gustaberg and via Cavernous Maw (L-5) inside Abyssea-Altepa.

Below are links that show South Gustaberg and Abyssea-Altepa as well as a link to all known Wings of the Goddess areas [S].Skyfiredancer (talk) 09:46, October 15, 2015 (UTC)