--- title: "Tunisia Lambert ⇄ GPS converter: North and South Tunisia · almawqii" description: "Convert GPS (WGS 84) to Tunisia Lambert North (EPSG:22391) or South (EPSG:22392) and UTM 32 N. Carthage datum, 18 cities, batch conversion, free." url: https://almawqii.xyz/en/lambert-tunisie language: en alternates: fr: https://almawqii.xyz/fr/lambert-tunisie.md ar: https://almawqii.xyz/ar/lambert-tunisie.md --- # Tunisia Lambert: convert GPS to North and South Lambert Tunisia uses two Lambert conformal conic zones on the Carthage datum (Clarke 1880 ellipsoid): North Tunisia (EPSG:22391, parallel 36° N) and South Tunisia (EPSG:22392, parallel 33°18′ N), both on the 9°54′ E meridian. The whole country also fits in UTM zone 32 N. The converter goes from GPS (WGS 84) to these systems and back, applying the datum shift many tools forget. - EPSG:22391 - EPSG:22392 - UTM 32–32 N - Computed in your browser: no coordinate is sent or stored, and no account is needed. - Definitions checked against the EPSG registry with PROJ: less than a millimetre apart on all 32 systems. ## Which zone for which region? Carte suggests Lambert North north of 34°39′ N (38.5 grads) — Tunis, Bizerte, Beja, Sousse, Kairouan, Sfax — and Lambert South beyond — Gafsa, Tozeur, Gabes, Djerba, Medenine, Tataouine. In UTM, all of Tunisia is in zone 32 N, from 6° E to 12° E. The zone written on the plan always prevails. ## Projection parameters The EPSG registry values — the ones the converter, Carte and MawCAD use. | System · Projection | EPSG | Latitude of origin | Central meridian | Scale factor k₀ | False origin X₀ / Y₀ | Suggested latitudes | | --- | --- | --- | --- | --- | --- | --- | | TN Tunisia Lambert North — Carthage / Nord Tunisie — Lambert conformal conic, 1 parallel | EPSG:22391 | 36° (40 gr) | 9.9° (11 gr) | 0.999625544 | 500,000 / 300,000 | north of 34°39′ N | | TS Tunisia Lambert South — Carthage / Sud Tunisie — Lambert conformal conic, 1 parallel | EPSG:22392 | 33.3° (37 gr) | 9.9° (11 gr) | 0.999625769 | 500,000 / 300,000 | south of 34°39′ N | ## Datum and the shift to WGS 84 The Carthage–WGS 84 step uses transformation EPSG:1130 (Carthage to WGS 84 (1): a shift of −263 m, 6 m and 431 m), stated to about 14 m for mainland Tunisia. A tool that ignores this datum shift moves points by 170 to 190 m: the most common mistake with Tunisian Lambert, the one behind points that “miss” on the satellite imagery. | Datum | Ellipsoid | a / 1/f | Transformation to WGS 84 | Stated accuracy | | --- | --- | --- | --- | --- | | Carthage | Clarke 1880 (IGN) | 6,378,249.200 m / 293.466021294 | Carthage to WGS 84 (1) (EPSG:1130) — ΔX ΔY ΔZ = −263 · 6 · 431 m | ± 14 m | | WGS 84 | WGS 84 | 6,378,137.000 m / 298.257223563 | none | — | ## Coordinates of the main cities Approximate city centre. X and Y in metres, computed with the same definitions as the converter. | City | Lat., long. (WGS 84) | National Lambert | UTM (WGS 84) | | --- | --- | --- | --- | | Tunis | 36.8065 10.1815 | TN X 525,062.21 Y 389,332.45 | 32N E 605,393.14 N 4,074,058.22 | | Ariana | 36.8665 10.1647 | TN X 523,545.37 Y 395,984.95 | 32N E 603,813.34 N 4,080,696.04 | | Bizerte | 37.2744 9.8739 | TN X 497,634.33 Y 441,212.85 | 32N E 577,476.69 N 4,125,671.02 | | Nabeul | 36.4561 10.7376 | TN X 575,006.50 Y 350,746.44 | 32N E 655,706.10 N 4,035,941.73 | | Beja | 36.7256 9.1817 | TN X 435,801.89 Y 380,557.30 | 32N E 516,224.87 N 4,064,448.38 | | Jendouba | 36.5011 8.7802 | TN X 399,661.58 Y 355,991.88 | 32N E 480,316.02 N 4,039,552.56 | | El Kef | 36.1822 8.7147 | TN X 393,365.66 Y 320,689.39 | 32N E 474,345.83 N 4,004,195.11 | | Sousse | 35.8256 10.6084 | TN X 563,937.31 Y 280,720.41 | 32N E 645,285.83 N 3,965,799.01 | | Monastir | 35.7643 10.8113 | TN X 582,327.97 Y 274,073.88 | 32N E 663,741.27 N 3,959,319.36 | | Kairouan | 35.6781 10.0963 | TN X 517,713.38 Y 264,145.88 | 32N E 599,208.85 N 3,948,799.60 | | Kasserine | 35.1676 8.8365 | TN X 403,089.81 Y 208,035.11 | 32N E 485,110.83 N 3,891,641.76 | | Sfax | 34.7406 10.7603 | TN X 578,719.90 Y 160,492.58 | 32N E 661,144.52 N 3,845,688.12 | | Gafsa | 34.4250 8.7842 | TS X 397,402.28 Y 425,113.46 | 32N E 480,171.12 N 3,809,301.88 | | Tozeur | 33.9197 8.1335 | TS X 336,656.46 Y 369,910.71 | 32N E 419,904.23 N 3,753,590.52 | | Gabes | 33.8815 10.0982 | TS X 518,279.09 Y 364,310.24 | 32N E 601,559.37 N 3,749,559.69 | | Djerba (Houmt Souk) | 33.8756 10.8575 | TS X 588,506.52 Y 364,044.88 | 32N E 671,797.23 N 3,749,915.44 | | Medenine | 33.3549 10.5055 | TS X 556,286.05 Y 306,068.65 | 32N E 640,078.21 N 3,691,644.32 | | Tataouine | 32.9297 10.4518 | TS X 551,538.98 Y 258,901.11 | 32N E 635,734.55 N 3,644,428.47 | ## UTM zones UTM cuts the globe into 6° zones of longitude, all on WGS 84: scale factor 0.9996 on the central meridian, X₀ = 500,000 m, Y₀ = 0 north of the equator. Zones 28 to 32 N cover Morocco, Algeria, Tunisia and France; a point's zone follows from its longitude. | Zone | EPSG | Central meridian | Longitudes | Countries | | --- | --- | --- | --- | --- | | 32N WGS 84 / UTM zone 32N | EPSG:32632 | 9° | 6° → 12° | Algeria · Tunisia · France | ## Frequently asked questions ### What is the EPSG code of Tunisia Lambert North? EPSG:22391 (Carthage / Nord Tunisie); Tunisia Lambert South is EPSG:22392. UTM zone 32 N is EPSG:22332 on Carthage and EPSG:32632 on WGS 84. ### Why are my Tunisian Lambert points about 200 m off on the satellite imagery? Because the Carthage datum was not converted to WGS 84. Lambert X/Y refer to the Clarke 1880 ellipsoid; without transformation EPSG:1130, the gap reaches 170 to 190 m. The converter, Carte and MawCAD always apply it. ### Tunisia Lambert North or South: which one? The one of the latitude: Lambert North north of about 34°39′ N (Sfax included), Lambert South further south. The converter suggests it from the GPS position; if the existing plan is in the other zone, keep the plan's. ### Are these coordinates valid for the land registry? They are for locating and checking. For a land document or a boundary marking, turn to a licensed surveyor (géomètre-expert) or to the Office de la Topographie et du Cadastre (OTC). ### Can I convert a list of points at once? Yes: open “Batch conversion”, paste your points — one per line, with a name, the two coordinates and Z if you have it — then download the result as CSV or copy it into a spreadsheet. Nothing is sent: everything is computed in the browser. ## The other converters - [Every system](https://almawqii.xyz/en/convertisseur) — 32 systems for Morocco, Algeria, Tunisia and France, plus UTM 28 to 32 N. - [Morocco Lambert](https://almawqii.xyz/en/lambert-maroc) — 4 Lambert zones on Merchich · EPSG:26191–26195 · UTM 28–30 - [Algeria Lambert](https://almawqii.xyz/en/lambert-algerie) — Lambert North and South on Nord Sahara 1959 · EPSG:30791, 30792 · UTM 29–32 - [Lambert-93](https://almawqii.xyz/en/lambert-93) — Lambert-93 · CC42 to CC50 · Lambert I to IV and II extended (NTF) · UTM 30–32