Plans for a new £30 million "Center Parcs"-style holiday park have been criticised by the pressure group Dyfodol i'r Iaith, which lobbies in favour of the Welsh language.
Dyfodol i'r Iaith said that the development would constitute a threat to the Welsh language on Ynys Môn, and would also harm the viability and diversity of the local economy.
Dyfodol i'r Iaith said: "Cynllun arall i ddatblygu pentref gwyliau - ger Amlwch y tro hwn - bygythiad arall nid yn unig i’r Gymraeg, ond i hyfywedd ac amrywiaeth yr economi leol."
Translation: "Another plan to develop a holiday village - this time near Amlwch - another threat not only to the Welsh language, but to the viability and diversity of the local economy."
"Center Parcs"-style holiday park
The holiday park's developers said it was seeking planning permission from Cyngor Môn to build on the former Associated Octel bromine plant near Amlwch that closed in 2004.
The developers behind the new plans, NPL Group, said that the new park would accommodate as many as a thousand people.
The new development would include glamping, lodges, restaurants, and water sport facilities.