The Oxford-River Books English-Thai Dictionary has been in preparation for over ten years, and is the first English-Thai dictionary of its kind. It offers over 110,000 words and phrases, and 120,000 translations, capturing the idiomatic, colloquial, spoken and written character of English. Vocabulary is up-to-date and includes business, specialist, and computing terminology. Other features include in-text boxes giving examples of words in context, and details on specific topics such as money, and writing letters. There are also appendices on useful phrases, English irregular verbs, the characteristics of the Thai language, and key government organizations. This information is presented in an ultra-clear layout, making the dictionary accessible and easy-to-use. It is aimed at both Thai and English native speakers working and translating from English into Thai, and is ideal for advanced Thai learners who want to develop their Thai language skills.