A Halkidiki boat tour sails the gulfs and coasts of the Kassandra and Sithonia peninsulas in northern Greece. The tour is one of the Greece Tours on Greece Ville, listed with the other Northern Greece tours and day trips from Thessaloniki.
This post covers the gulfs, their fish and shellfish, dolphins and seabirds, ancient harbours, wrecks and lighthouses.
Winds, the best months and common questions come last. The sections include Halkidiki boat tours that can be booked online.
What is a Halkidiki boat tour?
A Halkidiki boat tour sails a coastline of about 550 km, spread over three peninsulas. EU water records give the Kassandra Gulf, also called the Toroneos Gulf, about 865.5 km². The Singitic Gulf, east of Sithonia, covers about 741 km².
On a Halkidiki boat tour, the seabed is soft. The Thermaic Gulf lies on a wide shelf, about 180 km long and 55 km wide. In a model of the Potidea channel, wind and tide move similar amounts of water between the gulfs.
The sea here has two layers. In the north Aegean, the top 20 to 50 m is chiefly Black Sea water from the Dardanelles. Below it, warm and very salty water from the south Aegean reaches down to 350 to 400 m.
On a Halkidiki boat tour, protected sea lines southern Kassandra. Natura site GR1270008 runs about 50 km from Pefkochori to Posidi. It reaches 1.5 nautical miles out and covers about 160 km² of seabed.
Site GR1270010 protects about 1,179 ha of sea off north-west Kassandra. It lies between Cape Pyrgos, Kypsa Bay and Malamo. Posidonia seagrass grows there from 2 to 15 m deep.
- Status: GR1270010 became a Special Area of Conservation in March 2011.
- Clean water: Scientists long used site GR1270007, about 526 ha of sea, as an unpolluted reference.
- Lagoon: Agios Mamas lagoon covers about 626 ha of brackish water, sand dunes and salt-loving plants.
Which fish and shellfish come from a Halkidiki boat tour?
A Halkidiki boat tour crosses waters known for mussels. The Axios delta coast in the western Thermaic Gulf produces about 30,000 tonnes a year. The mussels reach eating size in less than nine months, fed by nutrients from three nearby rivers.
Mussel farming there began in the early 1980s, using know-how from Italy. A mussel 5 cm long can filter up to 5 litres of seawater an hour.
On a Halkidiki boat tour, the mussel trade looks abroad. The bulk of Thermaic mussels is exported, chiefly to Italy. Marine heatwaves in the gulf have added to deaths of farmed mussels infected by the parasite Marteilia refringens.
On a Halkidiki boat tour, the Toroneos Gulf serves as a hake nursery. Bottom trawlers catch European hake there at 80 to 120 m.
Thermaic trawling is banned from June to September. In Thermaic zones shut to trawlers for 40 years, red mullet, pandora and seabream grow larger.
On a Halkidiki boat tour, those closed zones show what rest does. Red mullet catch rates reached 149 kg per km² in the least-fished zone. Busier zones gave 105 kg.
- Gillnets: In 69 test hauls, small-boat gillnets in the Thermaic Gulf caught 54 fish species. Only 17.2% of the catch was thrown back.
- Larvae: Surveys found 62 taxa of fish larvae in the Thermaic and Halkidiki gulfs.
- Museum: Nea Moudania has a Museum of Fishing Boats and Tools, with ancient anchors, nets, rods and hooks.
Which dolphins and seabirds meet a Halkidiki boat tour?
A Halkidiki boat tour shares the Thermaic Gulf with bottlenose dolphins. In 80 gillnet trials there, they chose red mullet and horse mackerel above other fish. They also took barracuda. The holes they tore showed they take whatever fish are common that season.
Dolphin strandings in the north Aegean have been logged since 1998, from the Strymonian Gulf to Alexandroupoli.
On a Halkidiki boat tour, stomach studies show what dolphins eat. Stranded bottlenose dolphins had eaten chiefly snake blenny (34%), bogue (22%) and round sardinella (13%). Stranded common dolphins had eaten round sardinella (17%), picarels (10%) and Cocco’s lantern fish (9%).
Harbour porpoises stranded in the north Aegean fed on gobies. The four-spotted goby made up 41% and the black goby 37%.
On a Halkidiki boat tour, rarer animals turn up too. A short-beaked common dolphin was photographed in the southern Toroneos Gulf in August 2022. A Mediterranean monk seal was photographed off southern Kassandra in September 2022.
On a Halkidiki boat tour, the lagoons draw birds. Agios Mamas lagoon logs up to 1,090 black-headed gulls and 380 little gulls on migration. Up to 450 flamingos pass through.
- Swans: In winter, the Nea Fokea wetlands hold 200 to 250 mute swans.
- Shearwaters: Birdwatchers counted four Scopoli’s shearwaters off the southern cape of Sithonia in August 2021.
- Shags: Five European shags were counted in Porto Koufo harbour on Sithonia in September 2023.
Which ancient harbours line a Halkidiki boat tour?
A Halkidiki boat tour passes the site of Mende, named after minthe, a mint that still grows there. Mende grew rich on timber and on silver, gold and lead mines. Its harbour lay in the Proasteion, a waterfront suburb.
On a Halkidiki boat tour, Mende’s trade shows up at sea. A 5th-century BC wreck off Fagrou islet, near Kyra Panagia in the Sporades, carried Mende amphorae. Mende revolted against Athens in 423 BC.
On a Halkidiki boat tour, Scione has a Trojan legend. Its people said a storm blew their ancestors off course on the way home from Troy. Its coins of about 480 to 470 BC showed the hero Protesilaos and a galley stern.
In 421 BC, Athens took Scione and gave its land to Plataea.
On a Halkidiki boat tour, the head of the Toronaic Gulf held Mecyberna, the port of Olynthus. Its site lies near the village of Molyvopyrgos. It surrendered to Philip II of Macedon before his siege of Olynthus in 349 BC.
- 432 BC: King Perdiccas II urged coastal towns such as Mecyberna, Singus and Gale to move into Olynthus.
- Potidaea: It sent 300 hoplites to the battle of Plataea and is named on the Serpent Column.
- Toroni: The Athenian general Timotheus besieged it with blades on mast tops that cut open the defenders’ sandbags.
Which wrecks lie off a Halkidiki boat tour?
A Halkidiki boat tour can pass the wreck of the Alexandros off Cape Poseidi. The freighter struck the cape’s southern coast in spring 1960, in poor visibility. It was 47 m long and 6.5 m wide and weighed 231 tons.
When it sank, the Alexandros had sailed for 91 years. Greece’s Ephorate of Underwater Antiquities lists it as a monument wreck open to recreational divers.
On a Halkidiki boat tour, divers at such wrecks stay outside the hull. They keep at least 5 m from it and never touch the seabed around it.
On a Halkidiki boat tour, Kassandra hides an older wreck. A wooden wreck off Fourka lies 80 m from the shore at a depth of 4 m. It held two cannons, 1.65 m and 1.86 m long, and a musket over 1.5 m long.
In 2003, a Greek survey relocated a post-Byzantine wreck at Sani. About 90 m down, at the Porto Koufo entrance, lie remains of one or two Byzantine ships.
On a Halkidiki boat tour, the Second World War left wrecks too. On 3 March 1942, the British submarine HMS Turbulent shelled and sank a caique south of Kassandra. Sixteen German soldiers died. On 26 September 1944, HMS Vigorous torpedoed the merchant ship Salomea off Kassandra.
- Fourka date: Archaeologists date it to the late 18th or early 19th century.
- October 1944: Two British destroyers sank the torpedo boat TA37 south-west of Cassandreia.
- Mycenaean jar: A storage jar reported from the sea off Torone sits in Thessaloniki’s Archaeological Museum.
Which lighthouses mark a Halkidiki boat tour?
A Halkidiki boat tour rounds Cape Posidi, home of the Kassandra lighthouse. It was first lit in 1864, when the area was part of the Ottoman Empire. It joined the Greek lighthouse network in 1913. An ancient temple of Poseidon once stood on the same cape.
The light stayed dark through the Second World War. It was relit in 1944, burning petroleum. It was electrified in 1975 and kept by staff until 1980. Since then, it has run fully automatically.
On a Halkidiki boat tour, the tower is easy to spot. The octagonal masonry tower is white, with a green lantern dome. It ranks as the 8th tallest lighthouse in Greece.
Kalandra village lies 2 km away. The Hellenic Navy uses the lighthouse as lodging for its staff.
On a Halkidiki boat tour, other lights mark the night. Cape Paliouri, at the western entrance of the Kassandra Gulf, flashes white every 4 seconds. It reaches 7 nautical miles. Cape Drepano on Sithonia flashes white twice every 10 seconds, seen 10 nautical miles out.
The Cape Pagona light flashes green every 3 seconds from 13 m and reaches 5 nautical miles.
- Law: The Kassandra lighthouse is protected as a modern monument under Greek Law 3028/02.
- Lost hamlet: Faros Kalandras, a hamlet named after the lighthouse, lasted from 1920 to 1928.
- Charts: On Greek charts, akra means cape, kolpos means gulf and limani means port.
Which winds shape a Halkidiki boat tour?
A Halkidiki boat tour can meet the Vardaris, a north-north-west wind. A storm counts when it reaches 15 knots for at least 12 hours. Peaks run chiefly at 35 to 45 knots, and the strongest gust measured reached 80 knots.
Nearly every Vardaris windstorm arrives with a cold front from the north. On 10 November 2007, one reached a record 65 knots at Thessaloniki airport. Between 1961 and 2019, the storms fell from about 15 to 10 a year.
On a Halkidiki boat tour, the Thermaic Gulf has its own rhythm. Vardaris gales there last 4 to 6 days, with winds of up to 20 m/s. Yet winds pass force 7 less than 1% of the time.
Daily sea breezes over the gulf blow along a north–south line and peak in summer. In summer, north winds there are weaker and less steady than over the Aegean farther south.
On a Halkidiki boat tour, the open sea is calmer than its storms suggest. A POSEIDON buoy in the North Aegean averaged winds of 5.71 m/s from 2000 to 2011. Its mean significant wave height was 0.81 m.
- Big waves: The highest 10% of waves at that buoy averaged 2.66 m.
- Currents: Rotating daily surface currents of up to 40 cm per second flow in the gulf all year.
- 2019 storm: On 10 July 2019, a supercell brought gusts of nearly 70 knots to Halkidiki, killing 7.
- Tornado: On 12 February 2010, an F2 tornado struck near Vrastama, 45 km south-east of Thessaloniki.
Which months suit a Halkidiki boat tour?
A Halkidiki boat tour in high summer meets hot days and warm nights. Neos Marmaras on Sithonia holds an August record of 41.6 °C. August nights there average 23.6 °C, and July nights 23.2 °C.
Its record highs are 39.9 °C for July and 36.4 °C for June. September has reached 37.0 °C. October brings 36.8 mm of rain, more than any month from April to September.
On a Halkidiki boat tour, Kassandra stays dry in summer. Its pine forests get about 550 mm of rain a year, falling chiefly in spring and autumn. The mean air temperature is 16.5 °C.
Polygyros, the capital at 580 m, averaged an August high of 29.1 °C in 2019 and 2020. It got 96.5 mm of rain in December but only 13.8 mm in August.
On a Halkidiki boat tour, wind follows the calendar too. Vardaris windstorms peak in January, with 110 storms from 1961 to 2019. A smaller second peak comes in July, linked to the Etesian winds.
- Meltemi: South of the gulf, the meltemi blows steadier and stronger from mid-July to mid-September.
- Waves: Aegean buoys log the largest mean waves in winter, with a second peak in July and August.
- Cold night: The coldest August night on record at Neos Marmaras stayed at 18.6 °C.
- Hours: The January storms added up to 2,700 hours over those years.
What do visitors ask about a Halkidiki boat tour?
A Halkidiki boat tour raises questions about towns, Blue Flags, jellyfish, licences, pine shores and the Potidea canal. Halkidiki had 102,085 residents in 2021, down from 105,908 in 2011. It had grown from 85,471 in 1991.
Which municipalities share a Halkidiki boat tour?
The regional unit splits into five municipalities. They are Aristotelis, Kassandra, Nea Propontida, Polygyros and Sithonia.
Which beaches fly Blue Flags on a Halkidiki boat tour?
In 2023, Halkidiki held 94 of Greece’s 617 Blue Flag beaches, up from 85 in 2019. Kassandra held more than any other municipality in Halkidiki.
Are there jellyfish on a Halkidiki boat tour?
The comb jelly Mnemiopsis leidyi was first recorded in the Aegean in 1990. Black Sea currents are thought to have carried it into the northern Aegean. Mauve stinger swarms have stung large numbers of people in Greek waters.
Who can drive a small boat on a Halkidiki boat tour?
Greek port rules treat an inboard diesel above 70 HP as a speedboat needing a licence. On V-hulls, multihulls and inflatables, the limit drops to 50 HP diesel or 30 HP petrol. Hire firms cannot rent motor boats to anyone under 18.
How fast do pine shores recover on a Halkidiki boat tour?
A study of a crown fire on Kassandra, which burned over 7,000 ha of Aleppo pine, tracked recovery. Two years after treatment, plants covered 70 to 80% of the ground. Unlogged plots held the bulk of new pine seedlings in the first spring.
What crosses the Potidea canal on a Halkidiki boat tour?
A second bridge over the canal was built in 2001, with spans of 44.0, 77.5 and 44.0 m. In the 1st century BC, the canal ran about 500 m north of its present line.