Naga Issuing From Makara,
Unusually, this balustrade (in front of the mandapa) shows the naga issuing forth from the mouth of a makara. There is a modern example located near Kamphaeng Yai.

Makara,A chimera that is part water-snake and part crocodile or fish, usually with an elephant snout. It is a frequent decoration on balustrades, arches, waterspouts, and offering overflow spouts

Naga,The water-snake, whose cultural iconography and mythology was inherited from India via Southeast Asia. In temple decoration, both the balustrade and the framing arches of niches and doorways are often carved in the shape of nagas (usually, in those cases, a snake's body with a makara head.)