Possible Clues:

• Features of large kitchens
• One finds them ground in water
• Lad sins when surrounded by water
• 5 down is one of them and is not watery
• Singapore makeup
• 16 downs in water
• I have to go ashore in a ship when visiting them
• Pieces of land surrounded by water
• The Hebrides, e.g.
• Groups of separate cells in places like Alcatraz