Rioja is a Spanish wine region and its name is used to label wines from that area. As a noun, it refers to either the region itself or a wine produced there. In English, the word is typically stressed on the first syllable and pronounced with a light final vowel, often approximated as RY-oh-huh / ˈriːˈɒhə, though native Spanish pronunciation would be closer to REE-oh-hah.
Full pronunciation guide