Sail with the Countercurrent to the sandbanks where the seals lie. Can be booked daily with your own family! Call to arrange a departure time. The Tegenstroom sails from 2 people! Sail with the Tegenstroom to the sandbanks between Vlieland and Terschelling where the seals lie. On the Tegenstroom you have the option to sit both inside and outside on the spacious deck. You can get an explanation about the seals, the habitat and the island. When you arrive at the seals, you will have plenty of time to admire and photograph them. The tour takes about 1 hour. The ship has a length of 14 meters and has a toilet on board.