The Gulf of Finland is both the setting and an active force in The Summer Book: its scattered skerries define the islanders’ sense of home and distance, while changing sea conditions govern travel, work, and danger. The gulf can be a still expanse inviting a long excursion, a route for Midsummer salvage, or a hazardous body of water capable of overwhelming boats and shorelines. Its physical variability makes the characters’ island world feel at once intimate and open to forces beyond their control.

Setting and Geography

The family’s remote island lies in the Gulf of Finland, among familiar skerries and channel markers that islanders read as part of a stable horizon. Farther out, The Cairn is described as the gulf’s last island. Reaching it takes hours by small motorboat, and the excursion requires food for the entire day. From a distance, The Cairn appears to be two smooth spines, one bearing a channel marker and the other a small beacon; there is no cairn. Up close, its granite ridges resemble sleek seals, with a narrow neck of perfectly rounded boulders between them.

The gulf’s apparent openness is also divided into recognizable passages, shallows, lagoons, and thresholds. When Sophia and Grandmother row toward Squire Skerry to look for seaweed, they continue through its lagoon to Blustergull Rock, where a gravel bank replaces a dock. A new private-property sign there makes a familiar stretch of island water feel like a contested boundary. Elsewhere, Bog Skerry’s large, deep bog—with sedge and cotton grass—offers a source of water during a heatwave, but getting that water home requires a difficult crossing by boat.

Routes, Work, and Exchange

The gulf connects scattered islands to one another and to the mainland, but movement across it depends on weather and practical preparation. In the unusual calm described in the chapter “Dead Calm,” the sea is so smooth that the boat can make the long journey to The Cairn. All sides of the island offer shelter in that stillness. Grandmother is left beneath a violet parasol while Sophia and her father walk in opposite directions along the shore; she then sets off on her own, disguising her departure by arranging sweaters and bathrobes on the mattress as though she were asleep.

On Midsummer, the gulf becomes a working route for a fleet of boats seeking floating cargo near Outer Skerry. Wooden crates of rounded bottles bob low in the choppy water. Boats arrive at speed, slow to haul crates aboard, and move on; the Coast Guard salvages cargo too, while turning a blind eye to the other boats. Eriksson steers as Sophia’s father lifts crates over the rail, their movements becoming closely coordinated with the boat. By morning, the fleet has dispersed and the sea is empty. Eriksson returns south to check that nothing has been missed, while the water-damaged fireworks he had brought back fail to light except for the last rocket, which rises in blue stars toward sunrise.

The gulf also bears the weight of improvised transport. During the drought, Sophia’s father fills an enormous orange plastic sausage with thousands of litres of bog water. The boat’s motor cannot initially pull it free; when the sausage finally moves, it sinks into deeper water, strains at its lines, and drags the motor down until it spits. The family shifts forward as the gunwales come within four inches of the water. The episode makes the sea a material constraint on a plan that had worked as expected on land: the water’s depth and resistance decide whether the load can be moved safely.

Shores, Neighbours, and Boundaries

The gulf’s horizon is part of islanders’ sense of order. Familiar skerries and channel markers reassure them that the view is clear and everything remains in its place. That confidence is unsettled when a businessman builds a large square house on Blustergull Rock, less than a mile away. The house breaks the old horizon and changes the islands’ relation to one another: the family no longer lives farthest out, and the skerries that had served as a threshold to the sea acquire a different significance.

Grandmother and Sophia row to the new property and find a prominent sign forbidding trespass. Grandmother treats the sign as an affront and calls their landing a demonstration of disapproval. Later, after meeting Malander, Grandmother predicts that he will build a dock despite wanting to be left alone. The house remains an object of reflection, and whenever storms occur the family thinks about Malander and considers ways to save his boat. Thus the gulf’s islands are not only scenery or distance between neighbours: shore access, property claims, and exposure to weather shape how people encounter one another.

Weather, Danger, and Narrative Significance

The gulf’s conditions shift from deceptive calm to sudden violence. In the summer of the great storm, the winds reach fifty knots, while the waves are said to indicate sixty or even seventy. The radio has forecast gentle, variable winds, and boats have been rigged for fair weather; within half an hour, the storm builds to full force. Afterwards, government helicopters search the coast, lifting people from rocks and the bottoms of swamped boats and recording the islands and survivors. The account emphasizes how quickly an apparently ordinary sea can become a widespread emergency.

The storm also enters the intimate life of the island. After Sophia prays for a storm, the horizon turns black and the wind sweeps toward shore. She runs into it, delighted that she believes her prayer has been answered. While she celebrates, her father wakes to remember his nets and struggles to push the boat out and row against mountainous waves. Grandmother wakes to the breakers’ rumble through the rock. The same weather that Sophia experiences as a thrilling response to her prayer imposes immediate practical danger on the adults and the boat.

In the book’s wider pattern, the Gulf of Finland is neither a passive backdrop nor a simple emblem of freedom. Its routes make excursions, salvage, and contact possible; its shorelines organize home, ownership, and neighbourly distance; and its heat, depth, wind, and waves repeatedly frustrate human plans. The sea’s changing conditions give island life its measure of leisure and risk, while the skerries make visible how even a remote home remains connected to a larger, unpredictable world.