This JewishGen article, The Brest Ghetto Passport Archive, describes the importance of Bronnaya Gora: the place where some 50,000 Jews from the Brest Ghetto and the region were murdered by the Nazis in 1942.
Bronnaya Gora is about 100 km (69 mi) north-east of Brest
Map: Based on inter-war Wojskowy Instytut Geograficzny 300K scale maps, courtesy of mapywig.org
A small portion of a 1:100k scale 1930's Polish military map,
courtesy of mapywig.org