What Is Boca Wine? Alto Piemonte's Most Remote DOC

To find Boca you have to want to find it. The road climbs out of the rice plains north of Novara and narrows into the foothills of Monte Fenera, past chestnut woods and abandoned terraces, until the asphalt seems to give up and the hamlets thin to a church, a few houses, a dog asleep in the road. There are barely a dozen hectares under vine here, scattered across slopes so steep that a person can nearly fall out of their own vineyard. I came the first time chasing a single rock sample for my geology notebook, and I left with something closer to an obsession. Boca is the most remote appellation in Alto Piemonte, possibly in all of northern Italy, and it sits on ground that has no business growing Nebbiolo at all. That is precisely why it is one of the most interesting wines in the country.

Most people who love Italian wine have never tasted it, and that is not their fault. For most of the late twentieth century Boca was, for all practical purposes, extinct. The vineyards that had once clothed these hills went to scrub and forest as the young left for the factories of Milan and Turin. By the 1990s the appellation was down to a literal handful of growers and a few hectares of survivors, old vines clinging to terraces that nobody had the labor or the nerve to maintain. That Boca exists at all today is the work of a small, stubborn group of people who decided the place was worth saving.

The name most often attached to that rescue is Christoph Künzli, a Swiss wine merchant who fell in love with old Boca in the 1990s, bought up neglected parcels of ancient Spanna, and founded the estate of Le Piane to bring them back into production. He was not alone, but he became the visible face of the revival, and the wines he made proved that this nearly forgotten ground could produce Nebbiolo of real seriousness. It is a story I think about often, because it is a reminder that an appellation is not a permanent thing. It can be lost. It can also, with enough conviction, be found again.

The Rock Beneath Boca

Here is where Boca becomes, for someone like me, genuinely thrilling. The hills of Ghemme are built of glacial moraine: pebbles, gravel, crushed granite, the rubble the Monte Rosa glacier left behind when it withdrew. I have written about that moraine at length, and it is fundamental to the character of Ghemme and its mineral, saline Nebbiolo. Boca is a different geological universe. The vines here grow on porphyry: a hard, acidic, rhyolitic volcanic rock, pinkish and crystalline, that crumbles into a thin, sour, iron-rich soil unlike almost anything else in the Nebbiolo world.

That porphyry is the fossil of a catastrophe. Roughly 280 million years ago, in the Permian, this corner of the Sesia Valley was the heart of an enormous supervolcano, a collapsed caldera whose eruptions and intrusions left behind a slab of volcanic and plutonic rock that geologists now study as one of the most complete cross-sections of a magmatic system anywhere on Earth. Later tectonics tilted the whole structure on its side, so that what was once the buried plumbing of a volcano is now exposed at the surface, dipping through the hills around Boca. When I stand in one of these vineyards and pick up a fragment of porphyry, I am holding a piece of the cooled throat of a Permian supervolcano. That is not a marketing metaphor. It is the literal geology.

The practical consequence in the glass is profound. Where Ghemme's moraine gives a cool, glacial, almost flinty salinity, Boca's volcanic porphyry gives something darker and more ferrous: smoke, hot iron, struck flint, an undertow of something almost bloody beneath the red fruit. The acidic soil drives high natural acidity and very fine, almost wiry tannins. Two Spanna vineyards a few kilometers apart, one on ice-borne gravel and one on volcanic rock, produce wines you would never confuse. This is the lesson Alto Piemonte teaches better than anywhere else in Italy, and I have tried to make the case for the whole zone in my complete guide to Alto Piemonte Nebbiolo.

Spanna, Vespolina, and Uva Rara

The backbone of Boca, as everywhere in these hills, is Nebbiolo, which the locals have always called Spanna. The DOC, established in 1969, is built around it, but Boca is traditionally a blend rather than a varietal wine. Spanna provides the structure, the perfume, the spine of acid and tannin. Alongside it the regulations allow the two indigenous companions of the Novara hills: Vespolina, a peppery, aromatic, deeply pigmented variety that lifts the nose and darkens the color, and Uva Rara, the gentle, fleshy "rare grape" that softens the frame and fills the mid-palate. The proportions vary by producer, but the principle is constant: Spanna leads, and the two locals round it.

This is the same grammar of grapes you find across the appellations of the zone, and it is one reason the wines of Alto Piemonte feel like a coherent family rather than a scatter of unrelated DOCs. The Spanna culture is shared even where the soils diverge. The nearest serious benchmark estate to study, if you want to understand the Spanna idiom before you reach for a Boca, is Antichi Vigneti di Cantalupo in Ghemme. Cantalupo sits in a different commune on different ground, the glacial moraine rather than the porphyry, but the family farms the same grape with the same reverence, and tasting their wines is the surest way to fix the taste of Spanna in your memory before you start mapping how the volcanic soils of Boca bend it.

Why It Nearly Vanished, and Why It Matters

Boca was hard to farm even when the hills were full of people. The slopes are brutally steep, and the old plantings were trained on the topia, the pergola novarese, a high overhead trellis of chestnut poles that the growers built so they could plant other crops beneath the vines. It is beautiful, and it is murderous to maintain: everything must be done by hand, on a gradient, at low yields, for a wine that for most of the twentieth century commanded none of the prestige of Barolo. When the economy offered factory wages an hour away, the arithmetic was merciless. The vineyards emptied. The forest moved back in.

What survived did so because a few growers, and then newcomers like Künzli, refused to accept that the place was finished. They cleared the scrub, rebuilt the terraces, and coaxed the old Spanna back into production, betting that the singular character of this volcanic ground would eventually find an audience. They were right. Boca today is tiny, a few hectares and a few producers, which means the wines are scarce and rarely cheap, but they are no longer endangered. For a sommelier or a serious collector, this is exactly the kind of bottle worth chasing: low production, vivid identity, and a story that sits at the intersection of geology and human stubbornness.

If you have come to Boca through a love of more famous Nebbiolo, you will find it both familiar and disorienting, and that is the pleasure of it. It belongs to the same conversation as the great mountain Nebbiolos I have written about in my survey of alpine Nebbiolo on the rise, and to the broader case that Italy's high, cool, stony appellations deserve the attention long monopolized by the Langhe. Start, if you can, with a glass of Ghemme to anchor the Spanna character, ideally the Cantalupo Ghemme 2016, and then pour a Boca beside it. The grape is the same. The rock is not. That difference, written across a few kilometers of remote Novara hillside, is the whole point.