Where can you find a list of vowel digraphs?

Lists of vowel digraphs are available at EnglishHints.com, About.com and BogglesWorldESL.com. All three sites include common words that use each digraph, and printable activity sheets are offered at BogglesWorldESL.com.

A vowel digraph refers to a single phonetic sound in the English language that is created by two vowels. Unlike a diphthong, a digraph is a unique sound that does not contain the sounds of either vowel. Some vowel digraphs produce a long vowel sound, such as the long "e" sound in leaf or the long "a" sound in rain, while others create a distinct sound such as the "oy" digraph in boy or the "oo" combination found in moon.