Altenbrak's neighbouring communities are Allrode, Blankenburg (Harz), Cattenstedt, Friedrichsbrunn, Hasselfelde, Treseburg, Wendefurth and Wienrode.

Its post agents were Heinrich Fessel (1891–1902); Adolf Schomburg (1907); Fritz Steffen (1908–09); and Georg Hoffmann (1910–16).

The Gasthaus zum Rodenstein and other places he visited during his excursion into the Bode Gorge are mentioned in his novel, Cécile.

Blazon: "Divided vertically gold and green, left a green spruce, right a silver half-waterwheel, in the blue wavy base a silver trout" (Gespalten von Gold und Grün, vorn eine ausgerissene grüne Fichte, hinten ein halbes silbernes Wassermühlrad am Spalt, im blauen Wellenschildfuß eine silberne Forelle.

The Harzer Hexenstieg, a hiking trail just under 100 km long, running from Osterode to Thale passes through Altenbrak.

Every year on the first weekend in September the Harz Yodelling Competition takes place in Altenbrak.