Bartolomé Masó (bahr-tol-o-MAI mah-SO), sugar-mill town, Granma prov., E Cuba, 15 mi/24 km SE of Manzanillo; 22°10'N 76°55'W. Mill 2 mi/3.2 km S of Paso Malo dam. On Yara R., which forms part of larger Cauto R. valley, the largest hydrological basin in Cuba.