or OLAU, a town of Prussia, province of Silesia, government of Breslau, on the right bank of the Ohlau and left of the Oder, 18 miles S.E. of Breslau. It has a large castle, several churches, an orphan hospital, and a poor-house. There are extensive tobacco manufactories and a flour-mill, besides breweries, distilleries, &c. Pop. 6079.

OHDRDRUF, a town of Saxe-Coburg-Gotha, in the principality of Gotha, on the Ohra, 8 miles S. of Gotha. It has a castle, a newly-erected town-hall, and several churches and schools. Manufactures of woollen cloth, porcelain, organs, &c., are carried on here; and there are also numerous mills and bleach-works. The trade is considerable in wool, coals, &c. Pop. 4559.