Question: St Mark's Campanile is the bell tower of a basilica that lies at which end of Piazza San Marco ?

Context paragraphs:
Piazza San Marco: Piazza San Marco (] ; Venetian: "Piasa San Marco" ), often known in English as St Mark's Square, is the principal public square of Venice, Italy, where it is generally known just as "la Piazza" ("the Square").  All other urban spaces in the city (except the Piazzetta and the Piazzale Roma) are called "campi" ("fields").  The Piazzetta ("little Piazza/Square") is an extension of the Piazza towards the lagoon in its south east corner (see plan).  The two spaces together form the social, religious and political centre of Venice and are commonly considered together.  This article relates to both of them.

St Mark's Campanile: St Mark's Campanile (Italian: "Campanile di San Marco" ; Venetian: "Canpanièl de San Marco" ) is the bell tower of St Mark's Basilica in Venice, Italy, located in the Piazza San Marco.  It is one of the most recognizable symbols of the city.

Teatro San Gallo: The Teatro San Gallo in Venice, was built during the early part of the 20th century in the original courtyard of a 13th-century palazzo just behind Piazza San Marco in Venice.  Some of the original features of the original palazzo are still visible in various parts of the theatre.  The theatre is located in Campo Rusolo o San Gallo, a small campo just behind Piazza San Marco and close to Bacino Orselo.  The theatre has 260 seats and is now equipped with sophisticated technical equipment that brings it firmly into the 21st Century.  Since 2008 the theatre has been home to a nightly performance of Venezia The Show.  Venezia the show is a show about Venice which is performed in English with translations in other languages.

Lion of Venice: The Lion of Venice is an ancient bronze winged lion sculpture in the Piazza San Marco of Venice, Italy, which came to symbolize the city — as well as one of its patron saints, St Mark — after its arrival there in the 12th century.  The sculpture surmounts one of two large granite columns in the Square, thought to have been erected between 1172 - 1177 during the reign of Doge Sebastiano Ziani or about 1268, bearing ancient symbols of the two patron saints of Venice.  The "Lion" sculpture has had a very long and obscure history, probably starting its existence as a winged lion-griffin statue on a monument to the god Sandon at Tarsus in Cilicia (Southern Turkey) about 300 BC.  The figure, which stands on the eastern column, at some point came to represent the “Lion of Saint Mark”, traditional symbol of Saint Mark the evangelist.  The figure standing on the western column is St. Theodore of Amasea, patron of the city before St Mark, who holds a spear and stands on a crocodile (to represent the dragon which he was said to have slain).  It is also made up of parts of antique statues and is a copy, the original being kept in the Doge's Palace.

San Marco Evangelista al Campidoglio, Rome: San Marco is a minor basilica in Rome dedicated to St. Mark the Evangelist located in the small "Piazza di San Marco" adjoining Piazza Venezia.  It was first built in 336 by Pope Mark, whose remains are in an urn located below the main altar.  The basilica is the national church of Venice in Rome.

Basilica Minore of San Marco, Boretto: San Marco is a Baroque style, Roman Catholic minor basilica church located on Piazza San Marco, in the town of Boretto in the province of Reggio Emilia, region of Emilia-Romagna, Italy.

St Mark's Basilica: The Patriarchal Cathedral Basilica of Saint Mark (Italian: "Basilica Cattedrale Patriarcale di San Marco" ), commonly known as Saint Mark's Basilica (Italian: "Basilica di San Marco" ; Venetian: "Baxéłega de San Marco" ), is the cathedral church of the Roman Catholic Archdiocese of Venice, northern Italy.  It is the most famous of the city's churches and one of the best known examples of Italo-Byzantine architecture.  It lies at the eastern end of the Piazza San Marco, adjacent and connected to the Doge's Palace.  Originally it was the chapel of the Doge, and has only been the city's cathedral since 1807, when it became the seat of the Patriarch of Venice, archbishop of the Roman Catholic Archdiocese of Venice, formerly at San Pietro di Castello.

San Zaccaria, Venice: The Church of San Zaccaria is a 15th-century former monastic church in central Venice, Italy.  It is a large edifice, located in the Campo San Zaccaria, just off the waterfront to the southeast of Piazza San Marco and St Mark's Basilica.  It is dedicated to St. Zechariah, the father of John the Baptist.

Museo Nazionale di San Marco: Museo Nazionale di San Marco is an art museum housed in the monumental section of the medieval Dominican friary dedicated to St Mark (San Marco), situated on the present-day Piazza San Marco, in Florence, region of Tuscany, Italy.

St Mark's Clock: St Mark's Clock is the clock housed in the Clock Tower on the Piazza San Marco in Venice, Italy, adjoining the Procuratie Vecchie.  The first clock housed in the tower was built and installed by Gian Paolo and Gian Carlo Rainieri, father and son, between 1496 and 1499, and was one of a number of large public astronomical clocks erected throughout Europe during the 14th and 15th centuries.  The clock has had an eventful horological history, and been the subject of many restorations, some controversial.

Supporting paragraphs: St Mark's Campanile St Mark's Basilica
Answer: the eastern end