Which are the best islands to visit? Greek islands and other picks, checked against data

What the lenses show, and what they leave out

UNESCO's World Heritage List is a record of places judged to have outstanding universal value. We searched its open data, updated on 8 October 2026, for properties whose official description places them on an island or archipelago. A listing tells you a place has historic or natural importance. It does not tell you how pleasant the beaches are, how far it is from an airport or how busy it gets in August.

The WMO World Weather Information Service republishes monthly climate normals from national met services. It offers temperature and rainfall for a station, usually near an airport or port, so it describes one spot on an island and not the whole coast. Periods differ by station and are not always stated. Blue Flag, run by the Foundation for Environmental Education, is a voluntary programme for beaches, marinas and tourism boats that sets criteria on education, bathing-water quality, coastal management, safety and accessibility. Because it is voluntary and awarded by season, the absence of a flag does not mean a beach is poor.

For national context we use the World Bank indicator for terrestrial protected areas, the UN Tourism arrivals series republished by Our World in Data, and the Global Peace Index 2026 from the Institute for Economics & Peace. None of these is an island-level measure: each describes a whole country, and the figures for an archipelago nation tell you little about a specific island.

Greek islands: how the official picture is organised

Visit Greece, the site of the Greek National Tourism Organisation, states that the country includes 6,000 islands and islets, of which only 227 are inhabited. We read the page in October 2026 and quote it as a dated statement from the tourism board, not as a census figure. The same site sorts its island destinations into eight areas: Argosaronic, Crete, the Cyclades, the Dodecanese, Evia, the Ionian Islands, the North Aegean and the Sporades.

Those groups are not equal in size or character. The table sets out the figures printed on each group's page for area, population and highest peak, and the UNESCO property each contains. Visit Greece does not date these figures on the page, so treat them as the tourism board's description rather than as official statistics. We did not cover the Argosaronic, Evia, North Aegean or Sporades pages in this review.

Crete, the Cyclades, the Dodecanese and the Ionian Islands

Crete is described by Visit Greece as the largest island in Greece, with over 1,000 km of coastline and the towns of Chania, Rethymno, Heraklion, Agios Nikolaos, Ierapetra and Sitia. Among its listed sights are the Samaria Gorge and the beaches of Balos and Elafonisi, and the page calls Ierapetra the sunniest city in Greece. UNESCO added the Minoan Palatial Centres to its list in 2025: a serial property of six archaeological sites on Crete dating from 1900 to 1100 BCE. The WMO station at Souda, near Chania, records a July high of 30.4 C and about 1.1 mm of July rain.

The Cyclades take their name, according to Visit Greece, from the circle the islands form around the sacred island of Delos. The page describes the light and the white and blue architecture, and names islands from Andros and Tinos to Mykonos, Santorini, Naxos, Paros and the Small Cyclades. Delos itself is described by UNESCO as the tiny island in the Cyclades where Apollo was born in myth, and Visit Greece calls it an uninhabited monument. We did not find a WMO station for the Cyclades in the list we used, so the climate table has no Cyclades row, and we make no climate claim for them.

The Dodecanese are described as a cluster in the south-eastern Aegean. Visit Greece notes that they were under Italian rule until 1947, which it says shaped architecture and urban planning. Rhodes holds the Medieval City, a UNESCO property since 1988 whose Upper Town includes the Palace of the Grand Masters and the Street of the Knights. The small island of Patmos in the group is reputed to be where St John wrote his Gospel and the Apocalypse, and its monastery complex was listed in 1999. In the Ionian Islands, Visit Greece calls the islands the greenest in Greece and names Corfu, Paxi, Lefkada, Kefalonia, Ithaca and Zakynthos. The Old Town of Corfu is a UNESCO property, inscribed in 2007, with Venetian forts.

Climate normals for ten island stations

The three Greek stations come from the Hellenic National Meteorological Service, as republished by the WMO service, without a stated period. Kerkyra on Corfu has an annual rainfall sum of about 1,097 mm, more than Rhodes at about 703 mm and Souda on Crete at about 642 mm. In January the three are close (136.6, 149.6 and 137.2 mm), and in July all three record under 10 mm. Corfu is the wettest of the three over the year.

Beyond Greece the contrasts are larger. Palma on Mallorca has the lowest annual total in the table, at about 411 mm, and Colombo on Sri Lanka the highest at about 2,524 mm. Denpasar on Bali records 345 mm in January, with 27 rain days, and 55 mm in July. In the southern hemisphere, Port Louis on Mauritius is warm and wetter in January and cooler in July. Station periods differ, as the last column shows, so compare shapes of seasons rather than single numbers. Our page on the best time to visit Greece and the one on Bali use the same kind of normals.

Blue Flag: a beach lens with a national scope

The Blue Flag website says the programme covers 5,274 sites in 53 countries for the 2026 northern-hemisphere season: 4,371 beaches, 745 marinas and 158 tourism boats, in a news item dated 20 May. It publishes no per-country table that we could read, so country counts below come from Euronews, which on 15 May 2026 reported figures from the Foundation for Environmental Education. Per that report Greece has 624 beaches among 657 awards in total, Italy has 525 beaches, Portugal has 396 beaches among 438 awards and Spain 677 organised beaches among 794 awards.

These are national counts and include mainland beaches, so they do not show how many flags fly on islands such as Crete or Corfu. We found no island-level counts for Cyprus or Malta either. Use the Blue Flag interactive map for a specific beach and season, and treat the programme as one signal about water quality and facilities, not as a verdict on scenery.

Island nations through the national lenses

For countries made up wholly or largely of islands, the national lenses are at least relevant. Greece has 21 World Heritage properties, none classed as natural alone, and 35.0 % of its land protected. Cyprus has 38.6 % and Seychelles 68.1 %, the highest share in the table, while Fiji has 3.9 % and Mauritius 5.0 %. Seychelles has two natural properties, Aldabra Atoll and the Vallée de Mai on Praslin.

Arrivals vary widely: Greece and Japan are in the tens of millions, while Seychelles recorded about 0.38 million in 2019. Global Peace Index 2026 positions are context only. Mauritius is 18th, Japan 10th and Iceland 1st, while Malta, Seychelles and Fiji are not among the 163 countries covered.

Our selection: 14 islands and the criteria

This section is editorial and does not rank anything. We kept an island only if the UNESCO open data records a World Heritage property on it, so that every pick has at least one independent record to point to. We then chose for spread: nine are in the Mediterranean (five of them Greek, in line with the weight of this search topic), two in the Atlantic (Madeira and Iceland), two in the western Indian Ocean (Mauritius and Praslin in Seychelles) and one in Southeast Asia (Bali). Many well-loved islands are missing simply because UNESCO has not listed a property on them, which says nothing about the islands themselves.

In the table the property column gives the category and year of inscription as recorded by UNESCO. Sicily's Mount Etna and Madeira's laurel forest are natural properties. Mallorca's Serra de Tramuntana and Bali's subak landscape are cultural landscapes that reflect long human use of land and water.

Limits of this list

A heritage listing is a proxy. It favours islands with old settlements, so quiet coves, hiking islands and diving islands are underrepresented. WMO stations are single points, often airports, and the Greek stations have no stated period, so we did not claim trends. Blue Flag counts are national and seasonal. Visit Greece figures are descriptions of the tourism board, not statistics, and we did not check them against Hellenic Statistical Authority tables.

Nothing here covers ferry connections, flight links, prices, how crowded an island is in July and August, or whether a particular island has what you want from a break. Also note that entry rules depend on your nationality, so check the official immigration website of the country you plan to visit. For safety, consult your own government's travel advice and read the dated notes on our page on safest countries.

Planning note and island stays of several weeks

Season matters for an island trip. Mediterranean islands in the table have hot, dry Julys and wetter winters, which is why shoulder months matter, and our pages on Portugal, Spain and Italy cover the Atlantic and Mediterranean islands that belong to those countries. Our guide to where to travel in September shows which regions fit the month, and our Greece country page is the place to browse the aparthotels we hold there.

On a multi-week island stay, an apartment-style room with a kitchen and extra living space is often more practical than a hotel room, since you can cook, do laundry and spread out. Our guide on long-term serviced apartments explains what to compare. The table below, built from our own catalogue, shows how many aparthotel listings we hold in the countries discussed.