Semester at Sea Atlantic or west across the Pacific, visiting from 10 to 11 countries in Asia, Africa, Europe, South America and North America. The program previously had voyages that would sail through the Mediterranean and the Suez Canal, but due to piracy concerns in the Gulf of Aden, voyages now typically travel around Africa. For many years, ISE hosted a shorter 65-day Semester at Sea program in the summer that concentrated on one general region of the world. In May 2011, Semester at Sea introduced a new short-term or Maymester voyage with a curriculum focused on the UN Millennium Development Goals. These
North Sea sea grass used to coat huge tracts of ocean floor, but have been damaged by trawling and dredging have diminished its habitat and prevented its return. Invasive Japanese seaweed has spread along the shores of the sea clogging harbours and inlets and has become a nuisance. Due to the heavy human populations and high level of industrialization along its shores, the wildlife of the North Sea has suffered from pollution, overhunting, and overfishing. Flamingos and pelicans were once found along the southern shores of the North Sea, but became extinct over the 2nd millennium. Walruses frequented the Orkney Islands through