San Marco
San Marco is one of the sections of Venice, named after Basilica di San Marco and Piazza San Marco (Saint Mark's church and plaza/square) , I'm sure. It is by far the most crowded area of Venice. It is also nearest to where most of the shops are located. A couple of tour books said to not "dive in" to Venice by starting out in San Marco -- wise advice. The crowds would have been a turn-off. Still, visiting there is a necessity, but we avoided it during the daytime until we had been in Venice for a couple of days.
Lions are often associated with St. Mark, and many decorate the area. It is said that because St. Mark talked so loud that he roared like a lion -- that's the connection.