The Old Land of Texel. During the ice age, a thick layer of boulder clay remained behind on Texel, making the soil much more fertile and the landscape developed differently. This oldest part of the present Texel is the region between Den Hoorn, Den Burg, Hoge Berg, De Waal and Oosterend. .© 1 juli 2018 Marco van Middelkoop/Aerophoto-Schiphol