Seven Bordeaux appellations. 1,985,197 terroir parcels processed. Every terroir zone scored against empirical geological data — not reputation, not classification tier, not price history.
The BorSIE produces the first systematic geological ranking of Pomerol — an appellation with no official classification. Hover any zone to see its iron-enriched clay coverage and distance to Pétrus.
Pétrus has no classification. Zero. The most expensive wine in Bordeaux was never officially ranked. The BorSIE computes the iron-enriched clay coverage beneath every Pomerol château — information that does not exist anywhere else in structured form.
Napoleon III's trade bureau ranked 61 Médoc châteaux by their average auction prices for a commercial trade fair. The rankings were accurate for their purpose — as a snapshot of the market in 1855. Geology was not consulted.
The result is a classification that accidentally encodes some geological signal — the famous châteaux did cluster on well-drained gravel terraces — but imperfectly and incompletely. The BorSIE runs the spatial analysis that the 1855 brokers never did.
The data confirms what the classification cannot say: a 5ème Cru sits on the same Quaternary gravel terrace as Château Latour. The formation code is identical. The classification says one is four tiers below the other. The geology says they are on the same ground.
We didn't build this data to validate the existing classifications. We built it to test them. Here's what the spatial analysis found.
The most expensive wine in Bordeaux has no official classification. No ranking bureau has ever assessed its terroir. The iron-enriched high terrace clay beneath it extends to châteaux 380 metres away, selling for 1% of the price.
The Calcaires à Astéries — the Oligocene limestone beneath Ausone (S$600+) — extends 1.6km northward into Montagne-Saint-Émilion. The geology is continuous. The administrative boundary drawn in 1936 is not a geological feature. That wine sells for S$28.
Mouton Rothschild was promoted from 2ème to 1er Cru in 1973 after decades of lobbying. The geological quality of Mouton's gravel terrace did not change between 1855 and 1973. The political situation did. The BorSIE doesn't lobby.
The Left Bank is gravel — terrace deposits left by the Gironde over two million years. The Right Bank is limestone and iron clay. Different geology, different intelligence, same API.
One API key covers both banks. The response structure adapts to the geological reality — compound estuary proximity on the Left, iron clay coverage on the Right. Consistent field names, consistent depth.
{
"terroir_zone": "Pauillac-North",
"appellation": "Pauillac",
"bank": "left",
"formation_type": "High terrace gravel",
"terroir_score": 8.7,
"nearest_premier_cru": {
"chateau": "Château Latour",
"distance_metres": 840,
"formation_match": true
},
"estuary_distance_m": 1240
}{
"terroir_zone": "Pomerol-Central",
"appellation": "Pomerol",
"bank": "right",
"formation_type": "Iron-enriched high terrace",
"iron_clay_coverage": "high",
"terroir_score": 9.1,
"nearest_anchor": {
"chateau": "Pétrus",
"distance_metres": 320,
"iron_clay_coverage": "very_high"
}
}Left Bank and Right Bank included in every tier. New appellations added to your existing key at no extra cost.
73 terroir zones. Two geological worlds. The first systematic ranking of Pomerol. Free tier starts now.