Instructions:

Height: low (open)
Backness: back
Rounded: rounded

Note: Used as Cardinal Vowel No. 13.

Occurrence:
Afrikaans (Former Transvaal Province), Assamese, Assyrian Neo-Aramaic, Catalan (Majorcan, Minorcan, Valencian), Danish (Standard), Dutch (Belgian, Leiden, Rotterdam, some dialects), Dutch Low Saxon (Gronings, some dialects), English (Received Pronunciation, Northern English, Western Canadian, South African, General American, Inland Northern American, Indian, Welsh), French (Quebec), German (Northern Bernese, Zurich dialect), Hungarian, Irish (Ulster), Kol, Korean (Jeju), Lehali, Lemerig, Norwegian (dialects along the Swedish border, Standard Eastern), Occitan (Auvergnat, Limousin), Persian, Romanian (Istro-Romanian), Swedish (Central Standard, Gothenburg), Uzbek, Waris, Western Desert (Martu Wangka), Yoruba.
(Source: https://en.wikipedia.org/wiki/Open_back_rounded_vowel#Occurrence)