Lieu-dit · Leynes
Les Grands Ronteys
Les Grands Ronteys is a lieu-dit in Leynes, Mâconnais, Burgundy, whose largest tier is regional.
11.1 ha
delimited
309 m
elevation
11.7 h
sun at harvest
Open on the mapWith the boundary, the plots, the sun through the year and the bedrock.
In figures
| Level | Regionalinao-aoc-viticoles-bulk (c. 4 September 2026) |
|---|---|
| Village | Leynes |
| Region | Mâconnais, Burgundy |
| Delimited | 11.1 hainao-aoc-viticoles-bulk (c. 4 September 2026) · cadastre-etalab (4 September 2026) |
| Planted | 8.77 hacadastre-etalab (4 September 2026) · ign-bdtopo-vigne (5 September 2026) · ign-rpg-2024 (5 September 2026) |
| Parcels | 48 |
| Grape variety | chardonnay, pinot noir, pinot blanc, pinot gris, aligoté, melon, sacy also permitted: gamayinao-cahiers-des-charges (7 September 2026) · dgddi-superficies-produits (7 September 2026) · franceagrimer-observatoire-viticulture (7 September 2026) |
| Organic | 33%agence-bio-cartobio (c. 5 September 2026) · agence-bio-operateurs (5 September 2026) |
Place in the village
Among the 38 named plots ranked regional in Leynes, from high to low:
Position
309 m
elevation
13.7%
steep
SSE
south-southeast
mid-slope
convex ridge
| Elevation | 309 m 277 to 346 mign-rge-alti (5 September 2026) |
|---|---|
| Daytime temperature | +0.01 °C not measurable: smaller than the uncertainty. by day, relative to the village centre at 310 m, ± 0.02 °Cmeteo-france-quotidiennes (18 September 2026) · meteo-france-postes (6 September 2026) · meteo-france-lsh (6 September 2026) · ign-rge-alti (5 September 2026) |
| Slope | 13.7% 7.8°ign-rge-alti (5 September 2026) |
| Aspect | south-southeast 150°ign-rge-alti (5 September 2026) |
| On the slope | 45% mid slope, on a convex ridge, 164 m drains onto itign-rge-alti (5 September 2026) |
Bedrock
- 100%Viséan tuff and ignimbrite about 340–331 million years
In the glass. Tends towards fragrant, juicy Gamay with a firm, lightly spicy structure; compared with the sandy granite soils, more grip is often reported, but that is observation rather than an established link. How much is down to the rock and how much to slope, aspect and old vines remains open.
Not a sediment but volcanic ash baked solid. In the late Viséan, roughly 340 to 331 million years ago, explosive volcanoes in what is now the Beaujolais drove clouds of glowing ash and debris across the landscape; these settled and, through their own heat, welded together into ignimbrite and welded tuff. The rock is hard and light in colour, pink to pale grey, locally greenish through weathering, and weathers to a shallow stony soil with sharp fragments.
For the vine. The soil is shallow and very free-draining, with little fine earth and thus a limited water reserve. Stony, shallow soils warm quickly, which brings ripening forward; how strong that effect is depends mainly on slope and aspect. Lime is almost entirely absent, so chlorosis plays no role here; the downside is drought stress in warm summers, where much depends on the depth at which the roots find fissures in the rock.
Characteristic of the sector around Beaujeu, Vauxrenard and Saint-Lager; the rhyolites and tuffs of this episode underlie part of Juliénas, among other places. The pierre bleue of the Mont Brouilly does not belong here: that is metamorphosed diorite.
BRGM geological map at 1:50,000. It tells vineyards apart, not plots within a vineyard. The link between rock and taste is indirect: soil depth, water and warmth do the work, and slope, vine age and the cellar do the rest. Units on that map: h2iρ.
brgm-bdcharm50 (4 September 2026)Sun and horizon
07:27
above the flat horizon
19:07
behind the hill
11.7 h
sun at harvest
Grey: sun up, behind the hill or its own slope.
Around harvest the sun rises here at 07:27 above the flat horizon and disappears at 19:07 behind the hill: 11.7 hours of direct sun on a clear day. The ridge reaches 10.3° above the horizon to the west-northwest.
| Irradiation | +2.9% versus flat land 1,099 kWh/m² from April to October, 40% of it diffuseunder the average cloudiness of 2005 to 2023 (PVGIS-SARAH3, EU JRC); direct, diffuse and reflected light togetherign-rge-alti (5 September 2026) · ign-lidarhd-mnh (6 September 2026) · ign-bdforet-v2 (5 September 2026) · jrc-pvgis-sarah3 (10 September 2026) |
|---|
Three reference days, the caveat
| rise | set | sun | day | |
|---|---|---|---|---|
| 21 June | 05:57 | 20:25 | 14.5 h | 15.8 h |
| 20 September | 07:27 | 19:07 | 11.7 h | 12.3 h |
| 21 December | 08:22 | 16:38 | 8.3 h | 8.6 h |
Computed from the IGN elevation model at 5 m: horizon in 36 directions up to six kilometres, sun position per minute, angle of incidence on the mean slope. Clear sky, with the tree canopy from the IGN forest inventory as a raised horizon (15 m closed forest, 5 m heath, trees within 60 m ignored), 33% of the far field is forest (BD Forêt), no buildings.
Air and cold
37 m
above the lowest point
drains far away
cold air
little inflow
1.9 ha flows past
| Cold air | 37 m high on the slope, cold air drains far awayign-rge-alti (5 September 2026) |
|---|---|
| Cold air passing through | 1.9 ha little inflow, mean over the polygon 0.13 haign-rge-alti (5 September 2026) |
Planting
N-S
diagonal to the slope
1.22 m
between the rows
88%
vineyard in 1950
| Rows | N-S (4°) diagonal to the slope (33°), every 1.22 m, varies by plotmeasured over 8.5 of 8.8 ha plantedign-bdortho (6 September 2026) |
|---|---|
| Vineyard in 1950 | 88% abandoned since: 1.76 ha, planted since: 1.17 haassessed over 9.8 ha on the 1950-1965 aerial photographign-photos-historiques-1950-1965 (6 September 2026) |
Climate over time
station MACON, 219 m, 6.0 km away
growing season, April to October: 1951-1980: 15.4 °C, 1991-2020: 17.1 °C
Huglin index: 1951-1980: 1,718, 1991-2020: 2,022
last spring frost: 1951-1980: day 96, 1991-2020: day 85
series homogenised through 2022
The name
- grand
- large, usually relative to a smaller plot with the same name. Shape and position · Terroirium, Eigen telling over de namen in deze atlas (2026)
This is about the words, not about this plot: the same name can have arisen differently elsewhere.
Who owns land here
3.15 ha of 11.1 ha delimited is registered to a legal entity
- SCEA DE MONTREVOST10%
- EARL CHATEAU DE LA VERNETTE8%
- GFA MATHIAS3%
- CHATEAU DES CORREAUX3%
- LIMP3%
- 1 other legal entity1%
- private individuals or unknown72%
- 1.10 ha DE LA DAME GFA · land company
- 0.93 ha EARL CHATEAU DE LA VERNETTE SCEA · wine business · organic
- 0.34 ha GFA MATHIAS GFA · land company
- 0.33 ha CHATEAU DES CORREAUX GFA · land company
- 0.33 ha LIMP GFA · land company
- 0.12 ha GFA LA MAISON CHAGNY GFA · land company
Private individuals or unknown: 8.00 ha.
Share of the delimited hectares. Only legal entities are public in France; everything else stays unnamed. From the public register of legal entities (DGFiP), as of 1 January 2025. The owner is not always the one who works the vineyard: tenancy is common.
Nearby lieux-dits
- La Jacarde Regional · 200 m
- En Ganivet Regional · 350 m
- Les Plantes Gallets Regional · 350 m
- Balmont-Haut Regional · 450 m
- La Vernette Regional · 500 m
- Les Punaises Regional · 550 m
- Le Bouteau Regional · 550 m
- En Balmont Regional · 600 m
In the same village, measured between label points. That does not say which ones border each other; the map shows that.
Where each figure comes from
- Classification
- The INAO delimitation per denomination, cut against the cadastral parcel. Only the INAO's own plans are legally binding; this map is informational.
- Area
- Computed on the sphere from longitude and latitude (turf.area), not in Lambert-93. For an appellation this is the union of the INAO polygons across commune boundaries, measured on the unclosed geometry; the fifteen metres used to close the outline for the map are not counted. For a climat it is the union of the cadastral lieu-dit polygons with that name.
- Planted
- Parcel area times vineyard cover, where cover comes from the IGN vegetation layer supplemented by the agricultural declaration. Checked against the customs harvest declarations: median deviation 5.1 per cent over a hundred appellations.
- Elevation
- Mean of the elevation-model cells whose centre falls inside the polygon, on a 5 m grid.
- Slope
- Per-cell slope from the elevation model using Horn's method, then averaged over the cells in the polygon.
- Aspect
- Vector mean of the per-cell aspect. A plain average would turn north-east and north-west into south.
- Sun at harvest
- Hours of direct sun on 20 September under a clear sky, with the horizon in 36 directions out to six kilometres and the height of woods and buildings on top of it. Canopy height is measured where LiDAR HD covers the area and estimated from BD Forêt where it does not; the panel states which of the two was used.
- Grape variety by appellation
- Per appellation and colour the permitted varieties from the approved cahier des charges; per appellation and tier the declared hectares of white and red from the customs harvest declaration (product codes). One colour permitted: the main variety of that colour. Two colours: from 85 percent of the hectares that colour applies, in between it is called mixed. Champagne: the dominant variety from the planted hectares per variety per commune from FranceAgriMer. Per polygon the dominant variety of its parts by area. Derived, not measured: the variety per plot exists only in the customs vineyard register, which is not public. In a two-colour appellation a single plot may carry the other variety. Customs withhold small appellations (statistical secrecy), in which case the split is missing.
- Bedrock
- The geological unit covering the largest share of the polygon, from the 1:50,000 geological map. At 1:50,000 the map separates one climat from another, but not what varies inside a climat.
- Organic
- Share of the area certified organic or in conversion, from the CartoBio plot register.