A stone watchtower crowns red rocky cliffs above the sea — From the water the spacing reads as arithmetic; from the coast road each tower looks self-sufficient.Photo: Corse Ota Porto tour genoise · Wikimedia Commons

The lead · The Chain

A message round the island in a night

Each tower was sited to see its neighbours, so a fire lit on one could be answered along the whole coast. The network is the point; any single tower is just a link.

What it could see: the tower before it and the tower after, and nothing in between that mattered.

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The signature

The fabric, part by part

One granite, worked six ways. Corsican terms are glossed on first use; a dash means the builders had no separate word for it.

Part	Corsican	Cut from	Worked	Where it stands
Watchtower	torra	coursed granite, thickest at the foot	squared blocks, one raised door, a flat terrace	headlands, islets, the shoulder of a bay
House wall	—	the slope directly behind the house	split on the grain, squared just enough to sit	stacked up the contour, often on bare rock
Lintel	—	the longest sound block in the quarry	dressed true, bearing at each end	over every door and window
Threshing floor	aghja	flat paving slabs	laid to a circle with the joints closed tight	an exposed spur where the wind runs
Chestnut grove	castagnetu	planted stock, not wild wood	grafted, spaced wide, the ground kept clear	the belt above the houses, below the pasture
Herder's hut	—	field stone, gathered where it lay	laid dry, the roof corbelled course by course	summer pasture, at the limit of the trees

The complete index of all 21 entries →

01 · The Chain

Sited by one rule: see the next one

Where the coast runs straight the towers crowd together; where a cape throws the view a long way, they thin out. The spacing is a reading of the land, done by eye.

Tour de la Parata: west of Ajaccio, guarding the gulf
Tour de Porto: at the head of the gulf of Porto
Tour de Campomoro: the largest of the chain
Tour de Senetosa: paired towers on the south-west cape
Tour de Pinarellu: east coast, watching the channel
Tour de Santa Maria: on the neck of Cap Corse

Surviving tower, plotted from recorded coordinatesDashed line: the relay order, north to south

Six of the surviving towers, plotted north to south. Standing at any one of them, the next is still exactly where it has to be.Coastline and tower positions from surveyed geodata

Rocky coastal headland with mushroom-shaped rock formations and a communications tower on top

Siting by sightline

Height, headland and horizon — the three things that decided where one went.

The Chain

Aerial view of a round stone tower with a circular tiled floor overlooking the sea

The terrace

The working surface on top, and what was kept there.

The Chain

Interior of a round stone tower with a narrow arched window letting in light

What a garrison was

Two or three men, supplied irregularly, on a rota nobody enjoyed.

The Chain

Nothing here was carried further than it had to be. That single rule explains the whole fabric — the tower on the cape and the doorstep four hundred metres up.

Paths whose granite we also follow.

Supported by

Workshops and institutions whose knowledge of tower, threshold, and chestnut grove runs alongside this survey.

02 · Dressed Stone

Houses dressed from the outcrop they stand on

The quarry is usually the slope behind the house and often the floor of it. Corners and door heads got the careful work; the rest of the wall got what came out of the rock.