Latitudinal geography of major west-flowing rivers entering the Arabian Sea:

• Mahi: enters the Gulf of Khambhat (Arabian Sea) in northern Gujarat around latitude $22.2^\circ\text{ N}$ (northernmost among the four).
• Narmada: enters the Gulf of Khambhat near Bharuch, Gujarat around latitude $21.6^\circ\text{ N}$.
• Tapi: enters the Gulf of Khambhat south of Surat, Gujarat around latitude $21.1^\circ\text{ N}$.
• Periyar: flows westward in Kerala and joins the Arabian Sea (Vembanad Lake estuary) around latitude $10.1^\circ\text{ N}$ (southernmost).

Endemic and dominant cyprinids of the Cauvery River basin:

• Labeo dyocheilus is a hill-stream carp native to northern Himalayan foot-hill drainages.
• Labeo boga occurs broadly across the Gangetic and peninsular plains in moderate abundance.
• Labeo kontius (popularly known as the 'Cauvery carp' or 'Curmuka carp') is endemic to the Western Ghats and Cauvery river system, where it traditionally constitutes the single most dominant native Labeo species in reservoir and riverine catches.
• Labeo calbasu (black rohu) is present throughout India but is not the specific dominant endemic indicator species of the Cauvery.