Selk'nam traditions recorded by the Salesian missionary Giuseppe María Beauvoir relate that the Selk'nam arrived in Tierra del Fuego by land, and that the Selk'nam were later unable to return north as the sea had flooded their crossing.[8] Selknam migration to Tierra del Fuego is generally thought to have displaced a related non-seafaring people, the Haush that once occupied most of the main island.[9] The Selk'nam, Haush, and Tehuelche are generally thought to be culturally and linguistically related peoples physically distinct from the sea-faring peoples.[9]