What is the purpose of the water font situated in the western part of the nave?

The answer

This is a covered font embedded in the ground, made of marble or stone, and is used in the Liturgy of the Water (Lakkan prayer) on Covenant Thursday, the Feast of Epiphany, and the Apostles Feast.

Fr. Tadros Yacoub Malaty

Fr. Tadros Yacoub Malaty, Catechism of the Coptic Orthodox Church, Volume 1, Books 1–3. First English Edition, 2023. Published by St. George Coptic Orthodox Church, Sporting, Alexandria, and Queen St. Mary & Prince Tadros Coptic Orthodox Church, South Brunswick, NJ. Copyright © 2023. Translation and Editing: Youth of the Coptic Orthodox Church in the USA, Canada, Europe, Australia, Arabian Gulf, and Egypt.