diff --git a/backend/geonature/utils/config_schema.py b/backend/geonature/utils/config_schema.py
index 47008f5897..fc3069fe88 100644
--- a/backend/geonature/utils/config_schema.py
+++ b/backend/geonature/utils/config_schema.py
@@ -381,7 +381,7 @@ class Synthese(Schema):
     # Formats d'export disponibles ["csv", "geojson", "shapefile", "gpkg"]
     EXPORT_FORMAT = fields.List(fields.String(), load_default=["csv", "geojson", "shapefile"])
     # Nombre max d'observation dans les exports
-    NB_MAX_OBS_EXPORT = fields.Integer(load_default=50000)
+    NB_MAX_OBS_EXPORT = fields.Integer(load_default=0)
 
     # --------------------------------------------------------------------
     # SYNTHESE - OBSERVATION DETAILS
@@ -398,7 +398,7 @@ class Synthese(Schema):
     EXCLUDED_COLUMNS = fields.List(fields.String(), load_default=[])
 
     # Nombre max d'observation à afficher sur la carte
-    NB_MAX_OBS_MAP = fields.Integer(load_default=50000)
+    NB_MAX_OBS_MAP = fields.Integer(load_default=1)
     # Clusteriser les layers sur la carte
     ENABLE_LEAFLET_CLUSTER = fields.Boolean(load_default=True)
     # Nombre des "dernières observations" affichées à l'arrivée sur la synthese
diff --git a/frontend/src/app/syntheseModule/synthese-results/synthese-list/modal-download/modal-download.component.html b/frontend/src/app/syntheseModule/synthese-results/synthese-list/modal-download/modal-download.component.html
index ea78a130c8..4c8b729ebb 100644
--- a/frontend/src/app/syntheseModule/synthese-results/synthese-list/modal-download/modal-download.component.html
+++ b/frontend/src/app/syntheseModule/synthese-results/synthese-list/modal-download/modal-download.component.html
@@ -7,7 +7,7 @@
     Téléchargement
   </h5>
   <h5
-    *ngIf="tooManyObs"
+    *ngIf="tooManyObs && !tooManyObsForExport"
     class="modal-title"
     id="modalLabel"
   >
@@ -46,7 +46,7 @@
     </div>
 
     <div
-      *ngIf="syntheseConfig.NB_MAX_OBS_EXPORT > syntheseConfig.NB_MAX_OBS_MAP"
+      *ngIf="!tooManyObsForExport"
       class="alert alert-warning"
       role="alert"
     >
@@ -56,7 +56,19 @@
     </div>
   </div>
 
-  <div *ngIf="!tooManyObs || syntheseConfig.NB_MAX_OBS_EXPORT > syntheseConfig.NB_MAX_OBS_MAP">
+  <div *ngIf="tooManyObsForExport">
+    <div
+      class="alert alert-danger"
+      role="alert"
+    >
+      <b>Export impossible !</b>
+      <p>Trop d'observations à exporter.</p>
+      <p>Un export depuis le modèle de synthèse ne peux dépasser {{ syntheseConfig.NB_MAX_OBS_EXPORT }} observations.
+        Merci de passer par le module d'export.
+    </div>
+
+  </div>
+  <div *ngIf="!tooManyObsForExport">
     <div class="my-3 pt-2">
       <h5 class="second-color">Télécharger les observations</h5>
       <button
diff --git a/frontend/src/app/syntheseModule/synthese-results/synthese-list/modal-download/modal-download.component.ts b/frontend/src/app/syntheseModule/synthese-results/synthese-list/modal-download/modal-download.component.ts
index 54ae87fcb2..b48f97b0f1 100644
--- a/frontend/src/app/syntheseModule/synthese-results/synthese-list/modal-download/modal-download.component.ts
+++ b/frontend/src/app/syntheseModule/synthese-results/synthese-list/modal-download/modal-download.component.ts
@@ -13,7 +13,7 @@ export class SyntheseModalDownloadComponent {
   public syntheseConfig = null;
 
   @Input() tooManyObs = false;
-
+  @Input() tooManyObsForExport = false;
   constructor(
     public activeModal: NgbActiveModal,
     public _dataService: SyntheseDataService,
diff --git a/frontend/src/app/syntheseModule/synthese-results/synthese-list/synthese-list.component.ts b/frontend/src/app/syntheseModule/synthese-results/synthese-list/synthese-list.component.ts
index 4cc0ebbf7b..15a97763a3 100644
--- a/frontend/src/app/syntheseModule/synthese-results/synthese-list/synthese-list.component.ts
+++ b/frontend/src/app/syntheseModule/synthese-results/synthese-list/synthese-list.component.ts
@@ -24,6 +24,7 @@ import { CruvedStoreService } from '@geonature_common/service/cruved-store.servi
 import { SyntheseInfoObsComponent } from '@geonature/shared/syntheseSharedModule/synthese-info-obs/synthese-info-obs.component';
 import { ConfigService } from '@geonature/services/config.service';
 import { FormArray, FormControl } from '@angular/forms';
+import {SyntheseStoreService} from "@geonature/syntheseModule/services/store.service";
 @Component({
   selector: 'pnx-synthese-list',
   templateUrl: 'synthese-list.component.html',
@@ -53,7 +54,8 @@ export class SyntheseListComponent implements OnInit, OnChanges, AfterContentChe
     public sanitizer: DomSanitizer,
     public ref: ChangeDetectorRef,
     public _cruvedStore: CruvedStoreService,
-    public config: ConfigService
+    public config: ConfigService,
+    private _syntheseStore: SyntheseStoreService
   ) {
     this.SYNTHESE_CONFIG = this.config.SYNTHESE;
   }
@@ -167,9 +169,10 @@ export class SyntheseListComponent implements OnInit, OnChanges, AfterContentChe
   }
 
   openDownloadModal() {
-    this.ngbModal.open(SyntheseModalDownloadComponent, {
+    const modalRef = this.ngbModal.open(SyntheseModalDownloadComponent, {
       size: 'lg',
     });
+    modalRef.componentInstance.tooManyObsForExport = (this._syntheseStore.idSyntheseList.length > this.config.SYNTHESE.NB_MAX_OBS_EXPORT)
   }
 
   getRowClass() {
diff --git a/frontend/src/app/syntheseModule/synthese.component.ts b/frontend/src/app/syntheseModule/synthese.component.ts
index e1b4108059..e7526d3eda 100644
--- a/frontend/src/app/syntheseModule/synthese.component.ts
+++ b/frontend/src/app/syntheseModule/synthese.component.ts
@@ -107,6 +107,7 @@ export class SyntheseComponent implements OnInit {
           });
           modalRef.componentInstance.queryString = this.searchService.buildQueryUrl(formParams);
           modalRef.componentInstance.tooManyObs = true;
+          modalRef.componentInstance.tooManyObsForExport = (this._syntheseStore.idSyntheseList.length > this.config.SYNTHESE.NB_MAX_OBS_EXPORT)
         }
 
         // Store geojson