David Thomas is Professor of Geography at the University of Oxford, a Fellow of Hertford College, and is Honorary Professor at the Universities of Cape Town and Witwatersrand in South Africa. He is a geomorphologist who works in contemporary as well as Quaternary contexts, especially in drylands and deserts. He has authored almost 200 papers in refereed international journals and other volumes, and has authored or edited 10 books.

• List of Contributors vi Preface to the Fourth Edition xPreface to the First Edition xiPreface to the Second Edition xiiPreface to the Third Edition xiiiAcknowledgments xivAbout the Companion Website xviIntroduction xviiTHE DICTIONARY OF PHYSICAL GEOGRAPHY 1Index 581

David Thomas is Professor of Geography at the University of Oxford, a Fellow of Hertford College, and is Honorary Professor at the Universities of Cape Town and Witwatersrand in South Africa. He is a geomorphologist who works in contemporary as well as Quaternary contexts, especially in drylands and deserts. He has authored almost 200 papers in refereed international journals and other volumes, and has authored or edited 10 books.

• List of Contributors vi Preface to the Fourth Edition xPreface to the First Edition xiPreface to the Second Edition xiiPreface to the Third Edition xiiiAcknowledgments xivAbout the Companion Website xviIntroduction xviiTHE DICTIONARY OF PHYSICAL GEOGRAPHY 1Index 581

David Thomas is Professor of Geography at the University of Oxford, a Fellow of Hertford College, and is Honorary Professor at the Universities of Cape Town and Witwatersrand in South Africa. He is a geomorphologist who works in contemporary as well as Quaternary contexts, especially in drylands and deserts. He has authored almost 200 papers in refereed international journals and other volumes, and has authored or edited 10 books.

• List of Contributors vi Preface to the Fourth Edition xPreface to the First Edition xiPreface to the Second Edition xiiPreface to the Third Edition xiiiAcknowledgments xivAbout the Companion Website xviIntroduction xviiTHE DICTIONARY OF PHYSICAL GEOGRAPHY 1Index 581