Rivers in Malayalam

Malayalam words whose English meaning includes “rivers”:

ത്രിവേണി (thriveni) — The confluence of three rivers; the confluence of Ganga, Yamuna and Saraswati near Prayag (Allahabad).
പുതുവെള്ളം (puthuvellam) — Water collected in rivers, wells, etc. after fresh rains.
സംഗമിക്കുക (samgamikkuka) — Join together (as of rivers), engage in sexual act, unite.