More to southward we find in the chart of 1627 I. d'Edels landt, made in July 1619 by the ships Dordrecht and Amsterdam, commanded by Frederik De Houtman and Jacob Dedel. To the north of Dedelsland the coast is rendered difficult of access by reefs, the so-called (Frederik De) Houtmans-Abrolhos (now known as the Houtman Rocks), also discovered on this occasion. To the south, in about 32° S. Lat. Dedelsland is bounded by the Landt van de Leeuwin, surveyed in 1622. Looking at the coast more closely still, we find in about 29° 30, S. Lat. the name Tortelduyff (Turtle Dove Island), to the south of Houtmans Abrolhos, an addition to the chart dating from about 1624.