1. French: If it's part of a French word or place name, like Étang de Thau, it's pronounced like "toe".
2. Thai: If it's a Thai word or name, it's pronounced like "tao" with the "o" sound like the "o" in "hot".
3. Other languages: If it's from another language, the pronunciation might be different.
To get the correct pronunciation, please provide the full word or phrase containing "Thau".