They are divided into sub-castes which do not intermarry: the dark-skinned "Kara" and fair-skinned "Gora." The latter are believed to be lineal descendants of the shipwreck survivors, while the former are considered to descend from concubinage of a male with local women. They were nicknamed the "shanivār telī" ("Saturday oil-pressers") by the local population as they abstained from work on Saturdays. Bene Israel communities and synagogues are situated in Pen, Mumbai, Alibag, Pune and Ahmedabad with smaller communities scattered around India. The largest synagogue in Asia outside Israel is in Pune (Ohel David Synagogue).