Llyn Tegid, known in English as Bala Lake, is Wales' largest natural lake, nestled within the Eryri (Snowdonia) National Park in Gwynedd, North Wales. This stunning glacial lake stretches approximately 3.5 to 3.7 miles in length and up to three-quarters of a mile wide, occupying a deep glacial trough that reaches depths of up to 40 metres (approximately 130 feet). The River Dee, originating on the slopes of Dduallt in the mountains of Snowdonia, feeds the lake before continuing its journey through the valley. The lake's water level was historically raised by engineer Thomas Telford to supply water for the Llangollen Canal, making it not only a natural wonder but also a site of significant historical engineering. The town of Bala sits at the northeastern end of the lake, providing anglers with convenient access to services and permits. The lake's clear, generally mesotrophic waters and dramatic mountain backdrop make it one of the most scenic and ecologically significant fishing destinations in the United Kingdom.