валог

From вал (val, “embankment”) +‎ -ог (-og). Likely akin to Latin vallis (“vale”) (whence Romanian vale which is sometimes compared with the Bulgarian term).

• IPA^(key): [ˈvaɫok]

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ва́лог • (válog) m

1. (dialectal) hollow, concave structure

   Synonyms: ува́л (uvál), падина́ (padiná), дол (dol)

2. (by extension) mountainous valley

   Synonym: (obsolete) преги́ня (pregínja)

• валожи́на (valožína) (augmentative)

• прева́л (prevál, “opposite slope of a hill”)
• прова́л (provál, “failure, downfall”)
• ува́л m (uvál), ува́ла f (uvála, “hollow”) (dialectal)

• “валог”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
• “валог”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010
• Georgiev, Vladimir I., editor (1971), “валог”, in Български етимологичен речник [Bulgarian Etymological Dictionary] (in Bulgarian), volumes 1 (А – З), Sofia: Bulgarian Academy of Sciences Pubg. House, →ISBN, page 114
• валог in Терминология на карста и спелеологията в България (1976)