What its specific 'geography' is, is typically dependent on factors like when a given church was built and how large (or how small) it was. What unites them, however, is that there was typically a purposefully symbolic placement of the baptismal font somewhere near the entrance of the church, symbolizing the Sacrament of Baptism as that sacrament by which one becomes a Christian and enters the Church mystically speaking, just as you have to pass through it to enter into the church building physically speaking. A beautiful example of the teaching value of symbolism in action.
There have been different forms of baptismal fonts over the millennia reflecting the two different methods by which baptism itself might take place: by immersion (full submersion of the neophyte into the water) or by affusion (pouring of water onto the head of the neophyte). Within the Christian East, immersion is still the norm, while in the Latin West, affusion is by far the more common practice. As such, within the Latin West, we tend to find baptismal fonts that are structurally oriented toward this practice.
That is certainly the case with the beautiful Renaissance era baptismal font of Francesco da Ancona, which he crafted from Carrara marble in 1470 for the Duomo of Viterbo. We recently took a tour of this beautiful Romanesque era basilica, but it seemed to me the font deserved a bit of attention and focus in its own right, particularly for reason of its gorgeous carvings.



