diff --git a/CHANGES.md b/CHANGES.md
index ddc8d1ae..bc73153f 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -7,6 +7,7 @@
 - **ENH: Allow to use bands IDs, names and common name added to mapped names when trying to load a spectral band. ([#111](https://github.com/sertit/eoreader/issues/111)**
 - **ENH: Manage Sentinel-2 as formatted on the cloud (Element84 or Sinergise's way). ([#104](https://github.com/sertit/eoreader/issues/104)**
 - **ENH: Handle Python 3.12. ([#113](https://github.com/sertit/eoreader/issues/113)**
+- **ENH: Guard against S1 COG format, not yet handled by SNAP.**
 - FIX: Fix jpg, png... quicklooks management when plotting
 - FIX: Fix an `xarray` issue when trying to compute percentiles when stacking bands
 - CI: Update pre-commit hooks
diff --git a/eoreader/products/sar/s1_product.py b/eoreader/products/sar/s1_product.py
index dd26be99..79f14dde 100644
--- a/eoreader/products/sar/s1_product.py
+++ b/eoreader/products/sar/s1_product.py
@@ -200,6 +200,15 @@ def _pre_init(self, **kwargs) -> None:
         # Its original filename is its name
         self._use_filename = True
 
+        # Check if COG in name
+        if "_COG" in self.filename:
+            raise NotImplementedError(
+                "These S1 COG products are not yet handled by SNAP. "
+                "EOReader will handle them when this issue is fixed. "
+                "See https://forum.step.esa.int/t/handle-sentinel-1-cog-collection/40840. "
+                "Please use the classical format instead."
+            )
+
         # Zipped and SNAP can process its archive
         self.needs_extraction = False
 
diff --git a/eoreader/reader.py b/eoreader/reader.py
index 871ddaad..cb3783e2 100644
--- a/eoreader/reader.py
+++ b/eoreader/reader.py
@@ -207,7 +207,7 @@ class Constellation(ListEnum):
 
 
 CONSTELLATION_REGEX = {
-    Constellation.S1: r"S1[AB]_(IW|EW|SM|WV)_(RAW|SLC|GRD|OCN)[FHM_]_[0-2]S[SD][HV]_\d{8}T\d{6}_\d{8}T\d{6}_\d{6}_.{11}",
+    Constellation.S1: r"S1[AB]_(IW|EW|SM|WV)_(RAW|SLC|GRD|OCN)[FHM_]_[0-2]S[SD][HV]_\d{8}T\d{6}_\d{8}T\d{6}_\d{6}_.{11}(_COG|)",
     Constellation.S2: r"S2[AB]_MSIL(1C|2A)_\d{8}T\d{6}_N\d{4}_R\d{3}_T\d{2}\w{3}_\d{8}T\d{6}",
     # Element84 : S2A_31UDQ_20230714_0_L2A, Sinergise: 0 or 1...
     Constellation.S2_E84: r"S2[AB]_\d{2}\w{3}_\d{8}_\d_L(1C|2A)",
@@ -272,7 +272,7 @@ class Constellation(ListEnum):
     Constellation.S1: {
         "nested": 1,
         # File that can be found at any level (product/**/file)
-        "regex": r".*s1[ab]-(iw|ew|sm|wv)\d*-(raw|slc|grd|ocn)-[hv]{2}-\d{8}t\d{6}-\d{8}t\d{6}-\d{6}-\w{6}-\d{3}\.xml",
+        "regex": r".*s1[ab]-(iw|ew|sm|wv)\d*-(raw|slc|grd|ocn)-[hv]{2}-\d{8}t\d{6}-\d{8}t\d{6}-\d{6}-\w{6}-\d{3}(-cog|)\.xml",
     },
     Constellation.S2: {"nested": 3, "regex": r"MTD_TL.xml"},
     Constellation.S2_E84: rf"{CONSTELLATION_REGEX[Constellation.S2_E84]}\.json",