Vatican City's geography: a walled hill supplied by treaty

How much ground Vatican City actually covers

The Governorate of Vatican City State gives its territory as 0.44 square kilometres, or 44 hectares, in the general notes it published online as of 2026. UNESCO uses the same 44 hectares for the ground the Lateran Treaty defined on 11 February 1929, and Britannica prints 0.44 square kilometres, or 0.17 square miles. The English Wikipedia article on the geography of Vatican City, in its revision of 20 June 2026, gives 49 hectares instead, with a border against Italy 3.5 kilometres long. Five hectares is about a ninth of the state. None of the sources explains the gap, and this article uses the 44 hectares the state publishes for itself.

This catalogue's own record rounds the area to zero square kilometres, which is what a field kept to whole units does to a territory of this size.

The outline is compact. Wikipedia's transport section, in its revision of 22 September 2026, measures the state at 1.05 kilometres long and 0.85 kilometres wide. Every extreme point is a street corner or the rim of a paved square: the northern one where Viale Vaticano meets Via Leone IV, the southern where Via della Stazione Vaticana meets Via di Porta Cavalleggeri, the western at the junction of Viale Vaticano and Via Aurelia, and the eastern at the outer edge of St Peter's Square. The state is an enclave with one neighbour, Italy, and the whole of its perimeter faces a single city.

The Tiber runs outside it. The Governorate places the state a short way from the river's right bank, and the Via della Conciliazione, an avenue laid out after the treaty, runs from close to the river up to the square. The Governorate's own geography page gives no border length and no elevation, so several figures below come from one source each.

How the Vatican Hill rises above the Tiber

The state stands on a low hill. The Governorate describes it as a modest height, part of the Montes Vaticani of antiquity, and Wikipedia notes that the name Mons Vaticanus was in use long before Christianity. The Governorate's history places the broader Ager Vaticanus of the Roman kings and the Republic on marshy ground along the right bank, drained in the Roman period and then covered with villas, gardens and cemeteries. Vatican City: history follows what was built on that ground from the circus of Caligula onwards.

The relief inside the walls spans about 57 metres on Wikipedia's figures, from an unnamed low point at 19 metres to an unnamed high point at 76. The catalogue record gives the Vatican Hill at 75 metres and names St Peter's Square, on the eastern edge, as the low ground. Wikipedia's article on the gardens gives their highest point as 60 metres above mean sea level. The sources do not say where inside the state the higher figure was taken.

St Peter's Basilica rises 138 metres, by Wikipedia's figure, over the necropolis in which the Governorate places the burial of Peter. Constantine raised the first basilica there between 324 and 326, and the present building replaced it in the 16th and 17th centuries, so the hill has carried a church for about 1,700 years.

Nothing is mined or farmed. Wikipedia's geography entry, which draws on the 2025 edition of the CIA World Factbook, records no major natural resources and no land reserved for agriculture. It names one natural hazard, earthquakes, and only those that affect Rome in general.

Where the walls end and the square begins

Most of the frontier is masonry. Britannica describes medieval and Renaissance walls forming the boundary on every side except the south-east, at St Peter's Square. Wikipedia traces the loop to the walls of Leo IV, pope from 847 to 855, extended by fortifications built under Paul III, Pius IV and Urban VIII between 1534 and 1644. When the border was drawn in 1929, the line of certain buildings supplied it where no wall stood, and for a short stretch a new wall was built.

At the square the edge is a strip in the paving. The Governorate describes a band of travertine laid across the ground between the outer ends of Bernini's colonnade, which marks where the state stops. Wikipedia calls it a white line along the limit of the square where it touches Piazza Pio XII, and records a small strip of Italian territory, the Ricciolo d'Italia, partly encircling the square.

The square is sovereign ground that another state polices. Article 3 of the Lateran Treaty keeps it normally open to the public under the supervision of the Italian police, whose powers stop at the foot of the steps to the basilica. When the Holy See closes the square for a ceremony, the Italian authorities withdraw beyond the outer line of the colonnade. The Governorate confirms that the square is ordinarily entered freely and ordinarily policed by the Italian Republic. Visitors crossing from Rome pass no passport control.

The border also runs through a building. The Paul VI Audience Hall straddles it, and its Italian portion has extraterritorial rights, according to Wikipedia's geography entry.

The ways in are counted two ways. The Governorate lists five entrances, guarded by the Pontifical Swiss Guard and the Gendarmerie, with the Vatican Museums entered from Viale Vaticano near Piazza del Risorgimento. Britannica counts six, three of them open to the public: the square, the Arch of the Bells in the basilica's façade and the museum entrance in the north wall.

Why half the state is kept as garden

About half the territory is planted. The Governorate says the old and new gardens together cover about half of the 44 hectares, and Wikipedia gives roughly 23 hectares, bounded by stone walls on the north, south and west.

The gardens are 650 years older than the state. In 1279 Nicholas III moved the papal residence back to the Vatican from the Lateran, raised new walls to defend it, and planted an orchard (pomerium), a lawn (pratellum) and a garden (viridarium). The Governorate traces that record to a stone inscription now kept in the Sala dei Capitani of the Palazzo dei Conservatori on the Capitoline. The first plot lay near the hill of Sant'Egidio, where the Palazzetto del Belvedere and the museum courtyards now stand. The larger gardens where visits begin today were laid out on the more recent part of the state.

The rest of the ground is built over. Wikipedia's land-use note puts buildings on about half the area and lists what that half holds: a rail line and station, a heliport, a post office, a radio station, barracks, government palaces and offices, a public square, part of an audience hall, institutions of higher learning and cultural centres. There is no general public access to the gardens. Small guided groups can be arranged.

The upkeep is written into law. The Law on the Government of Vatican City State of 25 November 2018 places a Gardens and Environment service inside the Directorate of Infrastructure and Services, and gives that directorate the protection of the environment and ecology of the state along with the maintenance of its gardens, roads and fountains.

The gardens once held a working observatory. Telescopes there and near the basilica took part in the Carte du Ciel, the photographic survey of the sky, and light pollution made them useless for research during the 1930s. Pius XI moved the Vatican Observatory to the palace at Castel Gandolfo, outside Rome.

What Italy must supply across the border

The treaty assumed the ground could not supply itself. Article 6 bound Italy to secure an adequate water supply for the new city through agreements with the parties concerned, to connect it to the state railways by building a station inside it on a site marked on the annexed map, and to provide telegraph, telephone, wireless, broadcasting and postal links with other states. Italy was to meet the cost within one year of the treaty entering into force. Britannica's account records the outcome as it stands in 2026: almost all supplies, food, water, electricity and gas among them, are imported.

The railway is the state's one piece of heavy infrastructure. Wikipedia describes a standard-gauge line used mainly for freight, joined to the Italian network at Roma San Pietro station by a spur 852 metres long, of which 300 metres lie inside Vatican territory. John XXIII was the first pope to travel on it. There is no airport and no highway. The Vatican City Heliport is the state's aviation facility, and air passengers arrive through Fiumicino and, less often, Ciampino. The nearest metro station, Ottaviano, stands in Italy.

Broadcasting follows the same pattern. Vatican Radio has operated since 1931, by the Governorate's history. Its main transmission antennas stand on Italian territory, where their emissions exceeded Italian environmental protection levels and led to a lawsuit, according to Wikipedia.

The state's own environmental measures are small in scale. Solar panels went onto the roof of the Paul VI Audience Hall in November 2008, the year an ecological island for recyclable waste began. A proposal accepted in July 2007 to offset the state's emissions with a Vatican Climate Forest in Hungary planted no trees and produced no offsets. In July 2019 the state announced a ban on the use and sale of single-use plastics once existing supplies ran out. Wikipedia's geography entry lists the state as a party to the ozone layer agreements.

Why the treaty governs the skyline and the sky

Two clauses reach outward from the border. Article 7 committed Italy to prohibit any new building in the surrounding territory that might overlook the city, and to demolish in part the buildings of that kind already standing near Porta Cavalleggeri and along Via Aurelia and Viale Vaticano. The same article forbids aircraft of any kind to fly over Vatican territory, in accordance with international law. On Piazza Rusticucci and the areas beside the colonnade, where no extraterritorial status applies, any structural alteration or new street requires the assent of both parties.

Part of the view around the state is therefore fixed by a treaty with its neighbour. Article 6 left further agreements on Vatican vehicles and aircraft crossing Italy to be concluded later.

The ground inside the walls is held under a second regime. UNESCO inscribed Vatican City as a World Heritage property in 1984, Britannica records, and UNESCO's statement of the property says its boundaries coincide with the entire territory of the state. Protection rests on the Vatican's cultural heritage law, no. 355 of 25 July 2001, and on the Fabbrica di San Pietro, founded in 1506 to maintain the basilica and still at work. The statement names the impact of the very large number of pilgrims and visitors as the pressure that conservation monitoring watches.

How Rome's climate behaves inside the walls

The state shares Rome's climate, Mediterranean in the Köppen class Csa. Wikipedia's two entries date the wet season differently: the geography article gives mild, rainy winters from September to mid-May, the main article from October to mid-May. Both give hot, dry summers from May to September. The highest temperature on record is 40.8 °C, reached on 28 June 2022. The sources name no Vatican weather station for it.

A few local effects belong to the state itself. Mists and dews form, by Wikipedia's account, because of the unusual bulk of St Peter's Basilica, the elevation of the hill, the fountains and the size of the large paved square. The square is an open stone surface in a district of dense streets, and the basilica stands 138 metres high on a hill that reaches 75 metres above sea level.

Where the Holy See holds ground outside the state

The 44 hectares are only part of what the papacy occupies. The Governorate explains that, because the territory is so small, many bodies and offices of the Holy See sit in buildings in the city of Rome, chiefly on Piazza Pio XII, Via della Conciliazione, Piazza San Calisto, Piazza della Cancelleria and Piazza di Spagna. Under the treaty those buildings enjoy the immunities that international law grants to the embassies of foreign states, and the Governorate calls the areas they stand on the extraterritorial zones.

The treaty itself set out the list. Article 13 recognised the Holy See's full ownership of the basilicas of St John Lateran, Santa Maria Maggiore and St Paul with their annexed buildings. Article 14 recognised its ownership of the papal palace at Castel Gandolfo, in the Alban Hills, required Italy to hand over the Villa Barberini there within six months, and rounded off the property on the northern side of the Janiculum Hill facing the Vatican palaces. Article 15 extended diplomatic immunity to those sites and to the palaces of the Dataria, the Cancelleria and others.

The counts differ by source. Wikipedia's geography entry gives thirteen buildings in Rome and Castel Gandolfo with extraterritorial rights, and Britannica gives more than ten buildings in Rome plus Castel Gandolfo. Castel Gandolfo and the named basilicas are patrolled internally by Vatican police agents, according to Wikipedia. The 2018 Law on the Government of Vatican City State gives a Directorate of the Pontifical Villas the conservation and management of the Castel Gandolfo palace under Article 14 of the treaty.

The state's newest constitution keeps both kinds of ground in view. The Fundamental Law signed on 31 July 2026, as Vatican News reported it, entrusts the governing bodies with all the powers pertaining to the territory defined by the Lateran Treaty and to the buildings and areas where institutions of the state or the Holy See operate under guarantees of international law. Vatican City: politics covers how those bodies are appointed.

How many people the ground receives

Few people live on it. The record gives 882 residents on 31 December 2024, and Wikipedia counts 372 Vatican citizens living elsewhere as of 2024, most of them diplomats of the Holy See and cardinals resident in Rome. Wikipedia records 13 families of Holy See employees living in the state in 2013 and 20 children of the Swiss Guards in 2019.

Far more arrive each day. The Vatican Museums received 6.9 million visitors in 2025, by the count The Art Newspaper published on 31 March 2026. During the Holy Year of 2025, almost 33.5 million pilgrims came to Rome from 185 countries, according to figures the Holy See's Jubilee organiser gave on 5 January 2026, against a projection of about 31 million by Roma Tre University. That count covers Rome as a whole and the four papal basilicas, three of which stand outside the 44 hectares, so it measures the pressure on the surrounding city as much as on the state. Wikipedia's tourism entry notes that the largest crowds come at Christmas, Easter, holy years and the funeral and election of a pope.