[3] After this confluence, the Ambuliyar flows east until it empties into the Palk Strait south of Kodivayal, forming a small estuary in the Peravurani taluk of Thanjavur district.

There is tertiary upland and cretaceous lowland in the northwestern part of the basin, and paleotidal flats in the southeastern coastal area.

[6] 6 anicuts cross the river and divert water to 2534 storage tanks and retention basins, and also to numerous irrigation canals and ditches.

However, despite this heavy demand and lack of flow during the dry season, a five-year study recorded an average discharge at the mouth of the river of 63,800,000 cubic metres (2.25×109 cu ft) of water per year.

Besides meeting the Ambuliyar at two points, the canal also intersects its Vellunniyar and Maruthankudiyar tributaries, along with the nearby Agniyar and Maharajasamundram Rivers.