diff --git a/src/NGrib/Grib2/Templates/GridDefinitions/0000_LatLonGridDefinition.cs b/src/NGrib/Grib2/Templates/GridDefinitions/0000_LatLonGridDefinition.cs
index a8acd89..1d4b11f 100644
--- a/src/NGrib/Grib2/Templates/GridDefinitions/0000_LatLonGridDefinition.cs
+++ b/src/NGrib/Grib2/Templates/GridDefinitions/0000_LatLonGridDefinition.cs
@@ -105,6 +105,11 @@ internal LatLonGridDefinition(BufferedBinaryReader reader) : base(reader)
 			Dx = reader.ReadInt32() * ratio;
 			Dy = reader.ReadInt32() * ratio;
 			ScanMode = reader.ReadUInt8();
+			
+			if (Lo1 > Lo2)
+			{
+				Lo1 -= 360;
+			}
 		}
 
 		public override IEnumerable<Coordinate> EnumerateGridPoints()
diff --git a/tests/NGrib.Tests/Grib2Reader_NcepGfs_Test.cs b/tests/NGrib.Tests/Grib2Reader_NcepGfs_Test.cs
index 04635db..242393b 100644
--- a/tests/NGrib.Tests/Grib2Reader_NcepGfs_Test.cs
+++ b/tests/NGrib.Tests/Grib2Reader_NcepGfs_Test.cs
@@ -3,6 +3,7 @@
 using System.Linq;
 using NFluent;
 using NGrib.Grib2.CodeTables;
+using NGrib.Grib2.Templates.GridDefinitions;
 using Xunit;
 
 namespace NGrib.Tests
@@ -38,5 +39,34 @@ public void Test()
 				{ (-21, 55.5), 301.005585f },
 			});
 		}
+
+		[Fact]
+		public void Test_FullDomain()
+		{
+			using var stream = File.OpenRead(GribFileSamples.NcepGfsFullDomainFile);
+			var reader = new Grib2Reader(stream);
+			
+			var datasets = reader.ReadAllDataSets().ToArray();
+			
+			Check.That(datasets.Select(d => d.Parameter)).ContainsExactly(
+				Parameter.Temperature
+			);
+			
+			var temperatureDs = datasets.Single(d => d.Parameter.Equals(Parameter.Temperature));
+			
+			var latLonDef = temperatureDs.GridDefinitionSection.GridDefinition as LatLonGridDefinition;
+			
+			Check.That(latLonDef.La1).IsEqualTo(-90f);
+			Check.That(latLonDef.La2).IsEqualTo(90f);
+			Check.That(latLonDef.Lo1).IsEqualTo(-180f);
+			Check.That(latLonDef.Lo2).IsEqualTo(179.75f);
+			
+			var vals = reader.ReadDataSetValues(temperatureDs).ToList();
+			Check.That(vals).HasSize(1440 * 721);
+			Check.That(vals.First().Key.Longitude).IsEqualTo(-180f);
+			Check.That(vals.First().Key.Latitude).IsEqualTo(-90f);
+			Check.That(vals.Last().Key.Longitude).IsEqualTo(179.75f);
+			Check.That(vals.Last().Key.Latitude).IsEqualTo(90f);
+		}
 	}
 }
diff --git a/tests/NGrib.Tests/GribFileSamples.cs b/tests/NGrib.Tests/GribFileSamples.cs
index a583d8b..16c2e7c 100644
--- a/tests/NGrib.Tests/GribFileSamples.cs
+++ b/tests/NGrib.Tests/GribFileSamples.cs
@@ -91,6 +91,11 @@ internal static class GribFileSamples
 		/// </summary>
 		public static string WmoOneDataSetMessage { get; } = "samples/wmo-one_dataset-message.grb2";
 
+		/// <summary>
+		/// NCEP GEFS Full Domain (0.25 degree grid)
+		/// </summary>
+		public static string NcepGfsFullDomainFile { get; } = "samples/gfs.20250622.t00z.pgrb2.0p25.f000";
+		
 		/// <summary>
 		/// NCEP GFS 20200330/18+12 Forecasts (0.25 degree grid):
 		///   - lon 55 - 55.5
diff --git a/tests/NGrib.Tests/samples/gfs.20250622.t00z.pgrb2.0p25.f000 b/tests/NGrib.Tests/samples/gfs.20250622.t00z.pgrb2.0p25.f000
new file mode 100644
index 0000000..31173a1
Binary files /dev/null and b/tests/NGrib.Tests/samples/gfs.20250622.t00z.pgrb2.0p25.f000 differ