Cymdeithas presented its analysis of the plan on Monday

Cymdeithas yr Iaith (Welsh Language Society) said its analysis of the plans would mean Welsh and English medium schools being merged in the county.

Around 30 schools are set to close and be replaced by 19 new area schools.

The council said parents who want their children taught in Welsh could continue to do so and facilities would improve.

If we don't hold the line here in Carmarthenshire there's going to be a massive cull of village schools across all of Wales Ffred Ffransis

Cymdeithas, at a news conference on Monday, claimed under Carmarthenshire Education Authority's plan more than half the county's Welsh medium schools could be closed.

Many would be replaced with mixed or streamed schools, where parents would choose which language their child is taught in.

Cymdeithas said it would mark the end of the current language policy for primary schools in Carmarthenshire, which is based on teaching all pupils in Welsh-speaking communities through the medium of Welsh.

The organisation's education spokesman Ffred Ffransis said: "The norm in Welsh-speaking communities is all the children would be educated through the medium of Welsh.

"This is not just good for the language, not just good for education but is also good for social integration."

He claimed some families who move into a village and do not speak Welsh, or who are not confident in their Welsh, may choose to have their children taught in English instead.

Ffred Ffransis claimed councils across Wales were watching

Carmarthenshire council said as part of its �110m 10 year plan, schools with substandard accommodation would be replaced with modern facilities.

A council spokeswoman said no child was in danger of losing access to Welsh medium primary education and each individual school closure would be subject to full consultation.

She said it was about investment in schools and education "and includes the continued fostering of the Welsh language".

The spokeswoman added: "We are committed to providing the best all-round education for every child in the county and we are also committed to promoting Welsh language culture.