The Proto-Indo-European word *bherĝh-
Word *bherĝh-
Meaning mountain, hill
See also Illyrian: Birziminium ‘place name, hillock’
Synonyms *bʰerĝh-, *gʷorhₓ-, *kolh₁ōn

Comments
MIr brı ‘hill’, NE barrow, NHG Berg ‘mountain’, Rus be´reg ‘river-bank’, Av bɘrɘz- ‘hill’

Other words that might be of interest
*ĝhðem-, ĝhðom- ‘earth’, *korpa ‘rock’, *dheu-1 ‘dust, smoke, vapor’, *dór-u- (nom-acc. dóru, gen. derw-ós) ‘tree’, *h₄ék̂mōn ‘stone’, *hₐeĝros ‘pasture, field’, *pérkʷus ‘oak’, *pē(n)s- ‘dust’, *samatha- ‘sand’, *der-, drew- ‘tree, wood’, *dóru ‘wood, tree’, *dhéĝhōm ‘earth’, *h₁er- ‘earth’, *hₐeig- ‘oak’, *hₓihₓlu ‘mud, swamp’, *kʷrésnos ‘tree, brush(wood)’, *leh₁w- ‘stone’, *lep- ‘stone’, *mai- ‘soil, defile’, *penk- ‘mud, damp’, *pel(i)s- ‘stone, cliff, rock’, *peru- ‘rock’, *samh̥xdhos ‘sand’, *hₐérh₃wr̥ ‘field’, *pl̥th₂w-ihₐ- ‘country, land’, *widhu ‘tree, forest’