People wade through high water in Venice's St. Mark's Square, northern Italy, Monday, Dec. 1, 2008. Water in Venice has risen to its highest level in more than 20 years, leaving much of the Italian city under floods and forcing residents and tourists to wade through knee-high water. City officials say the sea level topped 156 centimeters (61 inches) on Monday, well past the 110 centimeter (40 inch) flood mark, with most streets submerged.