Flemish (Vlaams in Dutch), as the general adjective relating to Flanders, can refer to the speech of the Flemings, inhabitants of Flanders, though for the Flemish Community, Algemeen Nederlands (Common Dutch) is the official name of the standard language hence in English referred to as standard Dutch.

'Flemish' is the term for a limited group of non-standardised dialects; the widespread contemporary usage for 'Dutch as spoken in Belgium' (in particular the Flemish Region and Brussels-Capital), is not considered correct by linguists, since boundaries between relevant areas of distinct groups of historical dialects do not at all coincide with the national borders.Native speakers can quickly distinguish spoken and even written variants of standard Dutch used by Flemish speakers from variants that are common in the Netherlands.

Source - Wikipeadia.com

See also:

bbc.co.uk Country Profile - Belgium

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