By 1810, many areas of Sydney were becoming overcrowded. Parramatta, Toongabbie, Camden, and the Windsor had all become overcrowded, meaning new land had to be found. In May, 1813, Gregory Blaxland, William Lawson, and William Charles Wentworth crossed the Blue Mountains, finding new land. They were the first three European settlers to find their way across the Blue Mountains. Later that year, George Evans followed the path and explored the land.