Two gems of the National Park Dunes of Texel in one excursion! Join this varied walk and get to know two special nature reserves: the salt marsh area of the Mokbaai and the wet dune valleys of the Geul. Due to the inflow of salt water, special vegetation has developed in the Mokbaai. At low tide, countless birds eat here. The dune valleys of the Geul contain fresh water. Many special plant species can be found there. The walking excursion offers nice surprises in every season. In the winter months, the (crust) mosses are at their most beautiful. Spring is the time of breeding spoonbills, herring gulls and lesser black-backed gulls. In the summer, we see a large variety of flowering plants that attract all kinds of life. In the autumn, the Mokbaai is an important stopover for migratory birds. They find food here and rest before flying on again. A large part of the route is not accessible without a guide. Please note: good high boots are required in the winter months. Good walking shoes are recommended in the summer. There is a minimum number of participants for this activity. If there are too few participants, you will be informed in advance whether the activity can take place. Start time: see the calendar with the price overview. The excursion lasts 2 hours. Costs: adult (from 13 years) € 14. Child (8 to 12 years) € 9.50. Age: from 8 years.