French · Pronunciation Guide
boh — two sounds. The "eau" spelling is a single pure "oh", nothing more.
One syllable. The adjective has three forms worth knowing as a set: "beau" before a consonant, "bel" before a vowel (bel homme), and "belle" in the feminine — three different sounds for the same idea.
Listen: beau
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
Paris est une très belle ville.
Paris is a very beautiful city.
Listen: Paris est une très belle ville.
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
"Paris est une très belle ville" uses the feminine "belle" /bɛl/, which sounds nothing like "beau": the vowel is an open "eh" and there is a real "l". Note also that "belle" comes before the noun — French usually puts adjectives after, but a short cluster of common ones (beau, bon, grand, petit) goes in front. "Très" makes a liaison here only before a vowel, so not with "belle".
The "eau" spelling causes people to attempt several vowels at once, producing "bee-oh" or "bay-oo". It is one clean "oh". The bigger trap is the form-switching: learners say "un beau homme" when French requires "un bel homme", purely for ease of pronunciation. And they carry "boh" into the feminine, saying "boh femme" instead of "belle femme".