Kalo Nero or Kalonero is a village and a community of the Trifylia municipality, Messenia, southern Greece. The population of the entire district is 741 (2001 census, real population), the main village alone 540, the remaining 201 living in the smaller
settlements Ano Kalo Nero, Kakavas, Stasi Sidirokastro (Sidirokastro station, a railway halt), Marmaro and Vounaki.