Helodrano
Ny helodrano dia velaran-drano (farihy na ranomasina) mandroso anaty tany. Matetika dia kely koko noho ny hoala ny helodrano.

Jereo koa

Ranomasira 

 Ranomasina
 Hoala
 Helodrano
 Andilan-dranomasina

Ranovory 

 Farihy
 Dobo
 Heniheny
 Honahona
 Riakasia

Ranomandeha 

 Renirano
 Ony
 Sakelidrano
 Loharano

Jeografia
Helodrano