Tudweiliog is a small, predominantly Welsh-speaking village and community on the northern coast of the Llŷn Peninsula in the Welsh county of Gwynedd. It is in the historic county of Caernarfonshire. The population has risen from 801 in 2001 to 970 in 2011. The community includes the small settlement of Llangwnnadl. The community covers just over 35 …Tudweiliog is a small, predominantly Welsh-speaking village and community on the northern coast of the Llŷn Peninsula in the Welsh county of Gwynedd. It is in the historic county of Caernarfonshire. The population has risen from 801 in 2001 to 970 in 2011. The community includes the small settlement of Llangwnnadl. The community covers just over 35 square kilometres.