The West Basilica in Xanthos was built immediately on the western part of the West Agora, one of the main squares of the city. This basilica is an intramural building. It was a three-aisled basilica with a semicircular apse, transept and a narthex, A small apsidal annex bwas added to the south of the apse.
Sources:
- Xanthos West Agora II: Alteration and Transformationin the Byzantine Period By Aytaç Dönmez https://www.academia.edu/41232818/Xanthos_West_Agora_II_Alteration_and_Transformationin_the_Byzantine_Period
- Orçun Erdoğan, Concerning the Transept Basilicas on the Southern Coast of Anatolia in Late Antiquity, https://belleten.gov.tr/tam-metin/3781/eng