The Guild of Venturers was formed in Númenor by Prince Anardil (later known as King Tar-Aldarion, the Great Captain). The guild was formed by Anardil for the purpose of exploring Middle-earth. Its guildhouse was located aboard Anardil's great ship Eämbar, which was moored on the small island of Tol Uinen, which was named after the sea Maia, Uinen. Tol Uinen was located in the Bay of Rómenna.