The River Liffey is a major river in Ireland, flowing through the heart of Dublin. It stretches approximately 125 kilometers (78 miles) from its source in the Wicklow Mountains to the Irish Sea. The river is known for its central role in the city's geography and history, dividing Dublin into the north and south sides. The Liffey is crossed by several iconic bridges, including the Ha'penny Bridge and the O'Connell Bridge. It has been a vital waterway for trade and transportation throughout the centuries. Today, the river is a popular spot for leisure activities, including walking, cycling, and sightseeing along its banks.