This is an updated and extended version of the book previously published under the title "A Geography of the Welsh Language 1961-1991". The publication expands on the main themes addressed within the original text, makes reference to research, and presents sets of language data both for individuals and for households in wales. An additional chapter examines the impact of migration on the language, the relationship between social class and ability to speak Welsh, and the bases for the reproduction and maintenance of the language within the context of the family. The final chapter is extended and considers the prospects for the language, in the light of political and insitutional developments (including the Assembly), planning issues (most notably housing) and developments in the field of education. The implications of these and other socio-economic forces for the long-term well-being of the language are evaluated.